diff --git a/broker/config/wildfirechat.conf b/broker/config/wildfirechat.conf
index dc2e8997..9c9eb1b2 100755
--- a/broker/config/wildfirechat.conf
+++ b/broker/config/wildfirechat.conf
@@ -204,6 +204,9 @@ group.visible_quit_or_kickoff_notification 0
 ## 是否禁止陌生人拉人入群，默认为false
 group.disable_stranger_invite false
 
+## 群组信息是否标记删除
+group.enable_mark_deletion true
+
 ## 隐藏用户信息属性类型，2是性别，3是电话号码，4是邮箱，5是地址，6是公司信息，7是社交账号，8是Extra信息。当需要隐藏多个时以英文逗号分开;
 ## 本配置是为了提高安全性，避免把对应信息同步到客户端，这样就能防止程序被破解从而拿到用户关键信息。仅对客户端有效，server api不受影响。
 ## 注意，修改本配置不会对已经同步的信息产生影响。
diff --git a/broker/migrate/h2/V48__group_add_deleted_column.sql b/broker/migrate/h2/V48__group_add_deleted_column.sql
new file mode 100755
index 00000000..dce8d96c
--- /dev/null
+++ b/broker/migrate/h2/V48__group_add_deleted_column.sql
@@ -0,0 +1,2 @@
+alter table `t_group` add column `_deleted` tinyint NOT NULL DEFAULT 0;
+
diff --git a/broker/migrate/mysql/V55__group_add_deleted_column.sql b/broker/migrate/mysql/V55__group_add_deleted_column.sql
new file mode 100755
index 00000000..9f11961c
--- /dev/null
+++ b/broker/migrate/mysql/V55__group_add_deleted_column.sql
@@ -0,0 +1 @@
+alter table `t_group` add column `_deleted` tinyint NOT NULL DEFAULT 0;
diff --git a/broker/src/main/java/com/xiaoleilu/loServer/action/admin/GetGroupInfoAction.java b/broker/src/main/java/com/xiaoleilu/loServer/action/admin/GetGroupInfoAction.java
index 4014dfaa..0c442f70 100755
--- a/broker/src/main/java/com/xiaoleilu/loServer/action/admin/GetGroupInfoAction.java
+++ b/broker/src/main/java/com/xiaoleilu/loServer/action/admin/GetGroupInfoAction.java
@@ -60,6 +60,7 @@ public class GetGroupInfoAction extends AdminAction {
                     pojoGroupInfo.setMax_member_count(groupInfo.getMemberCount());
                     pojoGroupInfo.setHistory_message(groupInfo.getHistoryMessage());
                     pojoGroupInfo.setSuper_group(groupInfo.getSuperGroup()>0);
+                    pojoGroupInfo.setDeleted(groupInfo.getDeleted()>0);
                     result = RestResult.ok(pojoGroupInfo);
                 }
                 setResponseContent(result, response);
diff --git a/broker/src/main/java/com/xiaoleilu/loServer/action/robot/GetGroupInfoAction.java b/broker/src/main/java/com/xiaoleilu/loServer/action/robot/GetGroupInfoAction.java
index 3b57f286..d4ffb3fe 100755
--- a/broker/src/main/java/com/xiaoleilu/loServer/action/robot/GetGroupInfoAction.java
+++ b/broker/src/main/java/com/xiaoleilu/loServer/action/robot/GetGroupInfoAction.java
@@ -56,6 +56,10 @@ public class GetGroupInfoAction extends RobotAction {
                     pojoGroupInfo.setJoin_type(groupInfo.getJoinType());
                     pojoGroupInfo.setPrivate_chat(groupInfo.getPrivateChat());
                     pojoGroupInfo.setSearchable(groupInfo.getSearchable());
+                    pojoGroupInfo.setMax_member_count(groupInfo.getMemberCount());
+                    pojoGroupInfo.setHistory_message(groupInfo.getHistoryMessage());
+                    pojoGroupInfo.setSuper_group(groupInfo.getSuperGroup()>0);
+                    pojoGroupInfo.setDeleted(groupInfo.getDeleted()>0);
                     result = RestResult.ok(pojoGroupInfo);
                 }
                 setResponseContent(result, response);
diff --git a/broker/src/main/java/io/moquette/BrokerConstants.java b/broker/src/main/java/io/moquette/BrokerConstants.java
index e2bc9d19..29648be8 100755
--- a/broker/src/main/java/io/moquette/BrokerConstants.java
+++ b/broker/src/main/java/io/moquette/BrokerConstants.java
@@ -188,6 +188,8 @@ public final class BrokerConstants {
 
     public static final String GROUP_Disable_Stranger_Invite = "group.disable_stranger_invite";
 
+    public static final String GROUP_INFO_MARK_DELETION = "group.enable_mark_deletion";
+
     public static final String USER_HIDE_PROPERTIES = "user.hide_properties";
     public static final String USER_KEEP_DISPLAY_NAME_WHEN_DESTROY = "user.keep_display_name_when_destroy";
 
diff --git a/broker/src/main/java/io/moquette/imhandler/CreateGroupHandler.java b/broker/src/main/java/io/moquette/imhandler/CreateGroupHandler.java
index a6cf56ef..a4e5ecf8 100644
--- a/broker/src/main/java/io/moquette/imhandler/CreateGroupHandler.java
+++ b/broker/src/main/java/io/moquette/imhandler/CreateGroupHandler.java
@@ -27,7 +27,7 @@ public class CreateGroupHandler extends GroupHandler<WFCMessage.CreateGroupReque
 
         if (!StringUtil.isNullOrEmpty(request.getGroup().getGroupInfo().getTargetId())) {
             WFCMessage.GroupInfo existGroupInfo = m_messagesStore.getGroupInfo(request.getGroup().getGroupInfo().getTargetId());
-            if (existGroupInfo != null) {
+            if (existGroupInfo != null && existGroupInfo.getDeleted() == 0) {
                 return ErrorCode.ERROR_CODE_GROUP_ALREADY_EXIST;
             }
         }
@@ -59,7 +59,7 @@ public class CreateGroupHandler extends GroupHandler<WFCMessage.CreateGroupReque
         }
 
         WFCMessage.GroupInfo groupInfo = m_messagesStore.createGroup(fromUser, request.getGroup().getGroupInfo(), request.getGroup().getMembersList(), request.getMemberExtra(), isAdmin);
-        if (groupInfo != null) {
+        if (groupInfo != null && groupInfo.getDeleted() == 0) {
             if(request.hasNotifyContent() && request.getNotifyContent().getType() > 0) {
                 sendGroupNotification(fromUser, groupInfo.getTargetId(), request.getToLineList(), request.getNotifyContent());
             } else {
diff --git a/broker/src/main/java/io/moquette/persistence/DatabaseStore.java b/broker/src/main/java/io/moquette/persistence/DatabaseStore.java
index a783d861..8815d555 100644
--- a/broker/src/main/java/io/moquette/persistence/DatabaseStore.java
+++ b/broker/src/main/java/io/moquette/persistence/DatabaseStore.java
@@ -36,6 +36,7 @@ import java.util.function.Function;
 
 import static cn.wildfirechat.common.IMExceptionEvent.EventType.RDBS_Exception;
 import static cn.wildfirechat.proto.ProtoConstants.PersistFlag.Transparent;
+import static io.moquette.BrokerConstants.GROUP_INFO_MARK_DELETION;
 import static io.moquette.server.Constants.MAX_MESSAGE_QUEUE;
 import static cn.wildfirechat.proto.ProtoConstants.SearchUserType.*;
 import static win.liyufan.im.UserSettingScope.kUserSettingPrivacySearchable;
@@ -45,6 +46,7 @@ public class DatabaseStore {
     private final ThreadPoolExecutorWrapper mScheduler;
     private boolean disableRemoteMessageSearch = false;
     private boolean encryptMessage = false;
+    private boolean keepGroupInfo = false;
     public void setDisableRemoteMessageSearch(boolean disableRemoteMessageSearch) {
         this.disableRemoteMessageSearch = disableRemoteMessageSearch;
     }
@@ -55,6 +57,11 @@ public class DatabaseStore {
 
     public DatabaseStore(ThreadPoolExecutorWrapper scheduler) {
         this.mScheduler = scheduler;
+        try {
+            keepGroupInfo = Boolean.parseBoolean(Server.getServer().getConfig().getProperty(GROUP_INFO_MARK_DELETION, "false"));
+        } catch (Exception e) {
+
+        }
     }
 
     TreeMap<Long, Long> reloadUserMessageMaps(String userId) {
@@ -1425,7 +1432,8 @@ public class DatabaseStore {
                 ", `_join_type`" +
                 ", `_private_chat`" +
                 ", `_searchable`" +
-                ", `_member_dt`) values(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" +
+                ", `_deleted`" +
+                ", `_member_dt`) values(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" +
                 " ON DUPLICATE KEY UPDATE " +
                 "`_name` = ?," +
                 "`_portrait` = ?," +
@@ -1436,8 +1444,9 @@ public class DatabaseStore {
                 "`_mute` = ?" +
                 ", `_join_type` = ?" +
                 ", `_private_chat` = ?" +
-                ", `_searchable` = ?, " +
-                "`_member_dt` = ?";
+                ", `_searchable` = ?" +
+                ", `_deleted` = ?" +
+                ", `_member_dt` = ?";
 
 
             statement = connection.prepareStatement(sql);
@@ -1455,6 +1464,7 @@ public class DatabaseStore {
             statement.setInt(index++, groupInfo.getJoinType());
             statement.setInt(index++, groupInfo.getPrivateChat());
             statement.setInt(index++, groupInfo.getSearchable());
+            statement.setInt(index++, groupInfo.getDeleted());
             statement.setLong(index++, groupInfo.getMemberUpdateDt() == 0 ? System.currentTimeMillis() : groupInfo.getUpdateDt());
 
             statement.setString(index++, groupInfo.getName());
@@ -1467,6 +1477,7 @@ public class DatabaseStore {
             statement.setInt(index++, groupInfo.getJoinType());
             statement.setInt(index++, groupInfo.getPrivateChat());
             statement.setInt(index++, groupInfo.getSearchable());
+            statement.setInt(index++, groupInfo.getDeleted());
             statement.setLong(index++, groupInfo.getMemberUpdateDt() == 0 ? System.currentTimeMillis() : groupInfo.getUpdateDt());
             int count = statement.executeUpdate();
             LOG.info("Update rows {}", count);
@@ -3410,8 +3421,12 @@ public class DatabaseStore {
         PreparedStatement statement = null;
         try {
             connection = DBUtil.getConnection();
-            String sql = "delete from t_group where _gid = ?";
-
+            String sql;
+            if(keepGroupInfo) {
+                sql = "update t_group set _deleted = 1, _dt = _dt+1, _member_count = 0, _member_dt = _member_dt+1 where _gid = ?";
+            } else {
+                sql = "delete from t_group where _gid = ?";
+            }
 
             statement = connection.prepareStatement(sql);
             int index = 1;
diff --git a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
index 5fd7a7e5..326cf955 100755
--- a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
+++ b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
@@ -1368,7 +1368,7 @@ public class MemoryMessagesStore implements IMessagesStore {
             event.type = type;
             PojoGroupInfo pojoGroupInfo = new PojoGroupInfo();
             event.groupInfo = pojoGroupInfo;
-            if (groupInfo != null) {
+            if (groupInfo != null && groupInfo.getDeleted() == 0) {
                 pojoGroupInfo.setExtra(groupInfo.getExtra());
                 pojoGroupInfo.setName(groupInfo.getName());
                 pojoGroupInfo.setOwner(groupInfo.getOwner());
@@ -1900,7 +1900,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         WFCMessage.GroupInfo groupInfo = mIMap.get(groupId);
         if (groupInfo == null) {
             groupInfo = databaseStore.getPersistGroupInfo(groupId);
-            if (groupInfo != null) {
+            if (groupInfo != null && groupInfo.getDeleted() == 0) {
                 mIMap.set(groupId, groupInfo);
             } else {
                 return ErrorCode.ERROR_CODE_NOT_EXIST;
@@ -1985,7 +1985,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         WFCMessage.GroupInfo groupInfo = mIMap.get(groupId);
         if (groupInfo == null) {
             groupInfo = databaseStore.getPersistGroupInfo(groupId);
-            if (groupInfo != null) {
+            if (groupInfo != null && groupInfo.getDeleted() == 0) {
                 mIMap.set(groupId, groupInfo);
             } else {
                 return ErrorCode.ERROR_CODE_NOT_EXIST;
@@ -2069,13 +2069,6 @@ public class MemoryMessagesStore implements IMessagesStore {
         ArrayList<WFCMessage.GroupInfo> out = new ArrayList<>();
         for (WFCMessage.UserRequest request : requests) {
             WFCMessage.GroupInfo groupInfo = mIMap.get(request.getUid());
-            if (groupInfo == null) {
-                groupInfo = databaseStore.getPersistGroupInfo(request.getUid());
-                if (groupInfo != null) {
-                    mIMap.set(request.getUid(), groupInfo);
-                }
-            }
-
             if (groupInfo != null && groupInfo.getUpdateDt() > request.getUpdateDt()) {
                 if(!isAdmin && !StringUtil.isNullOrEmpty(fromUser)) {
                     WFCMessage.GroupMember gm = getGroupMember(groupInfo.getTargetId(), fromUser);
@@ -2306,7 +2299,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         IMap<String, WFCMessage.GroupInfo> groups = hzInstance.getMap(GROUPS_MAP);
         WFCMessage.GroupInfo groupInfo = groups.get(groupId);
         boolean isMute = false;
-        if (groupInfo != null) {
+        if (groupInfo != null && groupInfo.getDeleted() == 0) {
             if (groupInfo.getOwner().equals(memberId)) {
                 return ErrorCode.ERROR_CODE_SUCCESS;
             }
diff --git a/common/src/main/java/cn/wildfirechat/pojos/GetUserSessionResult.java b/common/src/main/java/cn/wildfirechat/pojos/GetUserSessionResult.java
index 8f60365c..19bb16fe 100644
--- a/common/src/main/java/cn/wildfirechat/pojos/GetUserSessionResult.java
+++ b/common/src/main/java/cn/wildfirechat/pojos/GetUserSessionResult.java
@@ -1,5 +1,6 @@
 package cn.wildfirechat.pojos;
 
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -33,3 +34,4 @@ public class GetUserSessionResult {
         userSessions = new ArrayList<>();
     }
 }
+
diff --git a/common/src/main/java/cn/wildfirechat/pojos/InputConferenceRequest.java b/common/src/main/java/cn/wildfirechat/pojos/InputConferenceRequest.java
old mode 100644
new mode 100755
index 56ca22f7..8a8626bc
--- a/common/src/main/java/cn/wildfirechat/pojos/InputConferenceRequest.java
+++ b/common/src/main/java/cn/wildfirechat/pojos/InputConferenceRequest.java
@@ -1,3 +1,11 @@
+/*
+ * This file is part of the Wildfire Chat package.
+ * (c) Heavyrain2012 <heavyrain.lee@gmail.com>
+ *
+ * For the full copyright and license information; please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 package cn.wildfirechat.pojos;
 
 public class InputConferenceRequest {
diff --git a/common/src/main/java/cn/wildfirechat/pojos/InputCreateGroup.java b/common/src/main/java/cn/wildfirechat/pojos/InputCreateGroup.java
index 133e7ab6..4c669748 100755
--- a/common/src/main/java/cn/wildfirechat/pojos/InputCreateGroup.java
+++ b/common/src/main/java/cn/wildfirechat/pojos/InputCreateGroup.java
@@ -68,6 +68,7 @@ public class InputCreateGroup extends InputGroupBase {
         if(group_info.isSuper_group()) {
             groupInfoBuilder.setSuperGroup(1);
         }
+        groupInfoBuilder.setDeleted(0);
 
         groupBuilder.setGroupInfo(groupInfoBuilder);
         if(group.getMembers() != null) {
diff --git a/common/src/main/java/cn/wildfirechat/pojos/InputGetUserSK.java b/common/src/main/java/cn/wildfirechat/pojos/InputGetUserSK.java
new file mode 100755
index 00000000..faed5a63
--- /dev/null
+++ b/common/src/main/java/cn/wildfirechat/pojos/InputGetUserSK.java
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the Wildfire Chat package.
+ * (c) Heavyrain2012 <heavyrain.lee@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+package cn.wildfirechat.pojos;
+
+public class InputGetUserSK {
+    private String uid;
+    private String cid;
+
+    public InputGetUserSK(String uid, String cid) {
+        this.uid = uid;
+        this.cid = cid;
+    }
+
+    public String getUid() {
+        return uid;
+    }
+
+    public void setUid(String uid) {
+        this.uid = uid;
+    }
+
+    public String getCid() {
+        return cid;
+    }
+
+    public void setCid(String cid) {
+        this.cid = cid;
+    }
+}
diff --git a/common/src/main/java/cn/wildfirechat/pojos/OutputReadData.java b/common/src/main/java/cn/wildfirechat/pojos/OutputReadData.java
index 61eab8ca..5b56b0c4 100644
--- a/common/src/main/java/cn/wildfirechat/pojos/OutputReadData.java
+++ b/common/src/main/java/cn/wildfirechat/pojos/OutputReadData.java
@@ -1,5 +1,14 @@
+/*
+ * This file is part of the Wildfire Chat package.
+ * (c) Heavyrain2012 <heavyrain.lee@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 package cn.wildfirechat.pojos;
 
+
 public class OutputReadData {
     public String user;
     public Conversation conversation;
diff --git a/common/src/main/java/cn/wildfirechat/pojos/PojoGroupInfo.java b/common/src/main/java/cn/wildfirechat/pojos/PojoGroupInfo.java
index 090426b5..f5d92b0b 100644
--- a/common/src/main/java/cn/wildfirechat/pojos/PojoGroupInfo.java
+++ b/common/src/main/java/cn/wildfirechat/pojos/PojoGroupInfo.java
@@ -22,6 +22,7 @@ public class PojoGroupInfo {
     int max_member_count;
     int history_message;
     boolean super_group;
+    boolean deleted;
 
     public String getTarget_id() {
         return target_id;
@@ -126,4 +127,12 @@ public class PojoGroupInfo {
     public void setSuper_group(boolean super_group) {
         this.super_group = super_group;
     }
+
+    public boolean isDeleted() {
+        return deleted;
+    }
+
+    public void setDeleted(boolean deleted) {
+        this.deleted = deleted;
+    }
 }
diff --git a/common/src/main/java/cn/wildfirechat/proto/WFCMessage.java b/common/src/main/java/cn/wildfirechat/proto/WFCMessage.java
index ff140ccc..394379e9 100644
--- a/common/src/main/java/cn/wildfirechat/proto/WFCMessage.java
+++ b/common/src/main/java/cn/wildfirechat/proto/WFCMessage.java
@@ -1651,6 +1651,16 @@ public final class WFCMessage {
      * <code>optional int32 super_group = 16;</code>
      */
     int getSuperGroup();
+
+    // optional int32 deleted = 17;
+    /**
+     * <code>optional int32 deleted = 17;</code>
+     */
+    boolean hasDeleted();
+    /**
+     * <code>optional int32 deleted = 17;</code>
+     */
+    int getDeleted();
   }
   /**
    * Protobuf type {@code GroupInfo}
@@ -1783,6 +1793,11 @@ public final class WFCMessage {
               superGroup_ = input.readInt32();
               break;
             }
+            case 136: {
+              bitField0_ |= 0x00010000;
+              deleted_ = input.readInt32();
+              break;
+            }
           }
         }
       } catch (com.google.protobuf.InvalidProtocolBufferException e) {
@@ -2214,6 +2229,22 @@ public final class WFCMessage {
       return superGroup_;
     }
 
+    // optional int32 deleted = 17;
+    public static final int DELETED_FIELD_NUMBER = 17;
+    private int deleted_;
+    /**
+     * <code>optional int32 deleted = 17;</code>
+     */
+    public boolean hasDeleted() {
+      return ((bitField0_ & 0x00010000) == 0x00010000);
+    }
+    /**
+     * <code>optional int32 deleted = 17;</code>
+     */
+    public int getDeleted() {
+      return deleted_;
+    }
+
     private void initFields() {
       targetId_ = "";
       name_ = "";
@@ -2231,6 +2262,7 @@ public final class WFCMessage {
       maxMemberCount_ = 0;
       historyMessage_ = 0;
       superGroup_ = 0;
+      deleted_ = 0;
     }
     private byte memoizedIsInitialized = -1;
     public final boolean isInitialized() {
@@ -2300,6 +2332,9 @@ public final class WFCMessage {
       if (((bitField0_ & 0x00008000) == 0x00008000)) {
         output.writeInt32(16, superGroup_);
       }
+      if (((bitField0_ & 0x00010000) == 0x00010000)) {
+        output.writeInt32(17, deleted_);
+      }
       getUnknownFields().writeTo(output);
     }
 
@@ -2373,6 +2408,10 @@ public final class WFCMessage {
         size += com.google.protobuf.CodedOutputStream
           .computeInt32Size(16, superGroup_);
       }
+      if (((bitField0_ & 0x00010000) == 0x00010000)) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeInt32Size(17, deleted_);
+      }
       size += getUnknownFields().getSerializedSize();
       memoizedSerializedSize = size;
       return size;
@@ -2521,6 +2560,8 @@ public final class WFCMessage {
         bitField0_ = (bitField0_ & ~0x00004000);
         superGroup_ = 0;
         bitField0_ = (bitField0_ & ~0x00008000);
+        deleted_ = 0;
+        bitField0_ = (bitField0_ & ~0x00010000);
         return this;
       }
 
@@ -2613,6 +2654,10 @@ public final class WFCMessage {
           to_bitField0_ |= 0x00008000;
         }
         result.superGroup_ = superGroup_;
+        if (((from_bitField0_ & 0x00010000) == 0x00010000)) {
+          to_bitField0_ |= 0x00010000;
+        }
+        result.deleted_ = deleted_;
         result.bitField0_ = to_bitField0_;
         onBuilt();
         return result;
@@ -2687,6 +2732,9 @@ public final class WFCMessage {
         if (other.hasSuperGroup()) {
           setSuperGroup(other.getSuperGroup());
         }
+        if (other.hasDeleted()) {
+          setDeleted(other.getDeleted());
+        }
         this.mergeUnknownFields(other.getUnknownFields());
         return this;
       }
@@ -3455,6 +3503,39 @@ public final class WFCMessage {
         return this;
       }
 
+      // optional int32 deleted = 17;
+      private int deleted_ ;
+      /**
+       * <code>optional int32 deleted = 17;</code>
+       */
+      public boolean hasDeleted() {
+        return ((bitField0_ & 0x00010000) == 0x00010000);
+      }
+      /**
+       * <code>optional int32 deleted = 17;</code>
+       */
+      public int getDeleted() {
+        return deleted_;
+      }
+      /**
+       * <code>optional int32 deleted = 17;</code>
+       */
+      public Builder setDeleted(int value) {
+        bitField0_ |= 0x00010000;
+        deleted_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>optional int32 deleted = 17;</code>
+       */
+      public Builder clearDeleted() {
+        bitField0_ = (bitField0_ & ~0x00010000);
+        deleted_ = 0;
+        onChanged();
+        return this;
+      }
+
       // @@protoc_insertion_point(builder_scope:GroupInfo)
     }
 
@@ -67305,7 +67386,7 @@ public final class WFCMessage {
       "dRequest\022\022\n\ntarget_uid\030\001 \002(\t\022\016\n\006reason\030\002" +
       " \002(\t\022\r\n\005extra\030\003 \001(\t\":\n\014Conversation\022\014\n\004t" +
       "ype\030\001 \002(\005\022\016\n\006target\030\002 \002(\t\022\014\n\004line\030\003 \002(\005\"" +
-      "\300\002\n\tGroupInfo\022\021\n\ttarget_id\030\001 \001(\t\022\014\n\004name" +
+      "\321\002\n\tGroupInfo\022\021\n\ttarget_id\030\001 \001(\t\022\014\n\004name" +
       "\030\002 \002(\t\022\020\n\010portrait\030\003 \001(\t\022\r\n\005owner\030\004 \001(\t\022" +
       "\014\n\004type\030\005 \002(\005\022\024\n\014member_count\030\006 \001(\005\022\r\n\005e" +
       "xtra\030\007 \001(\t\022\021\n\tupdate_dt\030\010 \001(\003\022\030\n\020member_" +
@@ -67313,172 +67394,172 @@ public final class WFCMessage {
       "pe\030\013 \001(\005\022\024\n\014private_chat\030\014 \001(\005\022\022\n\nsearch",
       "able\030\r \001(\005\022\030\n\020max_member_count\030\016 \001(\005\022\027\n\017" +
       "history_message\030\017 \001(\005\022\023\n\013super_group\030\020 \001" +
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+      "E\n\023SearchChannelResult\022\035\n\007channel\030\001 \003(\0132",
+      "\014.ChannelInfo\022\017\n\007keyword\030\002 \002(\t\"\235\002\n\016Messa" +
+      "geContent\022\014\n\004type\030\001 \002(\005\022\032\n\022searchable_co" +
+      "ntent\030\002 \001(\t\022\024\n\014push_content\030\003 \001(\t\022\017\n\007con" +
+      "tent\030\004 \001(\t\022\014\n\004data\030\005 \001(\014\022\021\n\tmediaType\030\006 " +
+      "\001(\005\022\026\n\016remoteMediaUrl\030\007 \001(\t\022\024\n\014persist_f" +
+      "lag\030\010 \001(\005\022\027\n\017expire_duration\030\t \001(\005\022\026\n\016me" +
+      "ntioned_type\030\n \001(\005\022\030\n\020mentioned_target\030\013" +
+      " \003(\t\022\r\n\005extra\030\014 \001(\t\022\021\n\tpush_data\030\r \001(\t\"\226" +
+      "\001\n\025AddGroupMemberRequest\022\020\n\010group_id\030\001 \002" +
+      "(\t\022\"\n\014added_member\030\002 \003(\0132\014.GroupMember\022\017",
+      "\n\007to_line\030\003 \003(\005\022\'\n\016notify_content\030\004 \001(\0132" +
+      "\017.MessageContent\022\r\n\005extra\030\005 \001(\t\"{\n\022Creat" +
+      "eGroupRequest\022\025\n\005group\030\001 \002(\0132\006.Group\022\017\n\007" +
+      "to_line\030\002 \003(\005\022\'\n\016notify_content\030\003 \001(\0132\017." +
+      "MessageContent\022\024\n\014member_extra\030\004 \001(\t\"a\n\023" +
+      "DismissGroupRequest\022\020\n\010group_id\030\001 \002(\t\022\017\n" +
+      "\007to_line\030\002 \003(\005\022\'\n\016notify_content\030\003 \001(\0132\017" +
+      ".MessageContent\"\245\001\n\rFriendRequest\022\020\n\010fro" +
+      "m_uid\030\001 \001(\t\022\016\n\006to_uid\030\002 \002(\t\022\016\n\006reason\030\003 " +
+      "\002(\t\022\016\n\006status\030\004 \001(\005\022\021\n\tupdate_dt\030\005 \001(\003\022\030",
+      "\n\020from_read_status\030\006 \001(\010\022\026\n\016to_read_stat" +
+      "us\030\007 \001(\010\022\r\n\005extra\030\010 \001(\t\"#\n\rGeneralResult" +
+      "\022\022\n\nerror_code\030\001 \002(\005\"?\n\025GetUploadTokenRe" +
+      "quest\022\022\n\nmedia_type\030\001 \002(\005\022\022\n\nmedia_path\030" +
+      "\002 \002(\t\"S\n\024GetUploadTokenResult\022\016\n\006domain\030" +
+      "\001 \002(\t\022\r\n\005token\030\002 \002(\t\022\016\n\006server\030\003 \002(\t\022\014\n\004" +
+      "port\030\004 \001(\005\"H\n\023HandleFriendRequest\022\022\n\ntar" +
+      "get_uid\030\001 \002(\t\022\016\n\006status\030\002 \002(\005\022\r\n\005extra\030\003" +
+      " \001(\t\"\023\n\005IDBuf\022\n\n\002id\030\001 \002(\t\"\027\n\tIDListBuf\022\n" +
+      "\n\002id\030\001 \003(\t\"\256\001\n\007Message\022#\n\014conversation\030\001",
+      " \002(\0132\r.Conversation\022\021\n\tfrom_user\030\002 \002(\t\022 " +
+      "\n\007content\030\003 \002(\0132\017.MessageContent\022\022\n\nmess" +
+      "age_id\030\004 \001(\003\022\030\n\020server_timestamp\030\005 \001(\003\022\017" +
+      "\n\007to_user\030\006 \001(\t\022\n\n\002to\030\007 \003(\t\"\353\001\n\004User\022\013\n\003" +
+      "uid\030\001 \002(\t\022\014\n\004name\030\002 \001(\t\022\024\n\014display_name\030" +
+      "\003 \001(\t\022\020\n\010portrait\030\004 \001(\t\022\016\n\006mobile\030\005 \001(\t\022" +
+      "\r\n\005email\030\006 \001(\t\022\017\n\007address\030\007 \001(\t\022\017\n\007compa" +
+      "ny\030\010 \001(\t\022\r\n\005extra\030\t \001(\t\022\021\n\tupdate_dt\030\n \001" +
+      "(\003\022\016\n\006gender\030\013 \001(\005\022\016\n\006social\030\014 \001(\t\022\014\n\004ty" +
+      "pe\030\r \001(\005\022\017\n\007deleted\030\016 \001(\005\"c\n\005Robot\022\013\n\003ui",
+      "d\030\001 \002(\t\022\r\n\005state\030\002 \002(\005\022\r\n\005owner\030\003 \001(\t\022\016\n" +
+      "\006secret\030\004 \001(\t\022\020\n\010callback\030\005 \001(\t\022\r\n\005extra" +
+      "\030\006 \001(\t\"(\n\017GetRobotsResult\022\025\n\005entry\030\001 \003(\013" +
+      "2\006.Robot\"g\n\030UploadDeviceTokenRequest\022\020\n\010" +
+      "platform\030\001 \002(\005\022\020\n\010app_name\030\002 \002(\t\022\024\n\014devi" +
+      "ce_token\030\003 \002(\t\022\021\n\tpush_type\030\004 \002(\005\"\201\001\n\026Mo" +
+      "difyGroupInfoRequest\022\020\n\010group_id\030\001 \002(\t\022\014" +
+      "\n\004type\030\002 \002(\005\022\r\n\005value\030\003 \002(\t\022\017\n\007to_line\030\004" +
+      " \003(\005\022\'\n\016notify_content\030\005 \001(\0132\017.MessageCo" +
+      "ntent\"\203\001\n\026SetGroupManagerRequest\022\020\n\010grou",
+      "p_id\030\001 \002(\t\022\014\n\004type\030\002 \002(\005\022\017\n\007user_id\030\003 \003(" +
+      "\t\022\017\n\007to_line\030\004 \003(\005\022\'\n\016notify_content\030\005 \001" +
+      "(\0132\017.MessageContent\"(\n\tInfoEntry\022\014\n\004type" +
+      "\030\001 \002(\005\022\r\n\005value\030\002 \002(\t\"0\n\023ModifyMyInfoReq" +
+      "uest\022\031\n\005entry\030\001 \003(\0132\n.InfoEntry\";\n\rNotif" +
+      "yMessage\022\014\n\004type\030\001 \002(\005\022\014\n\004head\030\002 \002(\003\022\016\n\006" +
+      "target\030\003 \001(\t\"=\n\022PullMessageRequest\022\n\n\002id" +
+      "\030\001 \002(\003\022\014\n\004type\030\002 \002(\005\022\r\n\005delay\030\003 \001(\003\"M\n\021P" +
+      "ullMessageResult\022\031\n\007message\030\001 \003(\0132\010.Mess" +
+      "age\022\017\n\007current\030\002 \002(\003\022\014\n\004head\030\003 \002(\003\"/\n\023Pu",
+      "llGroupInfoResult\022\030\n\004info\030\001 \003(\0132\n.GroupI" +
+      "nfo\"6\n\026PullGroupMemberRequest\022\016\n\006target\030" +
+      "\001 \002(\t\022\014\n\004head\030\002 \002(\003\"5\n\025PullGroupMemberRe" +
+      "sult\022\034\n\006member\030\001 \003(\0132\014.GroupMember\"-\n\013Us" +
+      "erRequest\022\013\n\003uid\030\001 \002(\t\022\021\n\tupdate_dt\030\002 \001(" +
+      "\003\"0\n\017PullUserRequest\022\035\n\007request\030\001 \003(\0132\014." +
+      "UserRequest\"/\n\nUserResult\022\023\n\004user\030\001 \002(\0132" +
+      "\005.User\022\014\n\004code\030\002 \002(\005\"-\n\016PullUserResult\022\033" +
+      "\n\006result\030\001 \003(\0132\013.UserResult\"^\n\020QuitGroup" +
+      "Request\022\020\n\010group_id\030\001 \002(\t\022\017\n\007to_line\030\002 \003",
+      "(\005\022\'\n\016notify_content\030\003 \001(\0132\017.MessageCont" +
+      "ent\"~\n\030RemoveGroupMemberRequest\022\020\n\010group" +
+      "_id\030\001 \002(\t\022\026\n\016removed_member\030\002 \003(\t\022\017\n\007to_" +
+      "line\030\003 \003(\005\022\'\n\016notify_content\030\004 \001(\0132\017.Mes" +
+      "sageContent\"u\n\024TransferGroupRequest\022\020\n\010g" +
+      "roup_id\030\001 \002(\t\022\021\n\tnew_owner\030\002 \002(\t\022\017\n\007to_l" +
+      "ine\030\003 \003(\005\022\'\n\016notify_content\030\004 \001(\0132\017.Mess" +
+      "ageContent\"\206\001\n\026ModifyGroupMemberAlias\022\020\n" +
+      "\010group_id\030\001 \002(\t\022\r\n\005alias\030\002 \002(\t\022\017\n\007to_lin" +
+      "e\030\003 \003(\005\022\'\n\016notify_content\030\004 \001(\0132\017.Messag",
+      "eContent\022\021\n\tmember_id\030\005 \001(\t\"\206\001\n\026ModifyGr" +
+      "oupMemberExtra\022\020\n\010group_id\030\001 \002(\t\022\017\n\007to_l" +
+      "ine\030\002 \003(\005\022\'\n\016notify_content\030\003 \001(\0132\017.Mess" +
+      "ageContent\022\r\n\005extra\030\004 \001(\t\022\021\n\tmember_id\030\005" +
+      " \001(\t\"P\n\020UserSettingEntry\022\r\n\005scope\030\001 \002(\005\022" +
+      "\013\n\003key\030\002 \002(\t\022\r\n\005value\030\003 \002(\t\022\021\n\tupdate_dt" +
+      "\030\004 \002(\003\"A\n\024ModifyUserSettingReq\022\r\n\005scope\030" +
+      "\001 \002(\005\022\013\n\003key\030\002 \002(\t\022\r\n\005value\030\003 \002(\t\"\032\n\007Ver" +
+      "sion\022\017\n\007version\030\001 \002(\003\"8\n\024GetUserSettingR" +
+      "esult\022 \n\005entry\030\001 \003(\0132\021.UserSettingEntry\"",
+      "f\n\006Friend\022\013\n\003uid\030\001 \002(\t\022\r\n\005state\030\002 \002(\005\022\021\n" +
+      "\tupdate_dt\030\003 \002(\003\022\r\n\005alias\030\004 \001(\t\022\017\n\007black" +
+      "ed\030\005 \001(\005\022\r\n\005extra\030\006 \001(\t\"*\n\020GetFriendsRes" +
+      "ult\022\026\n\005entry\030\001 \003(\0132\007.Friend\"7\n\026GetFriend" +
+      "RequestResult\022\035\n\005entry\030\001 \003(\0132\016.FriendReq" +
+      "uest\"\243\001\n\021ConnectAckPayload\022\020\n\010msg_head\030\001" +
+      " \001(\003\022\023\n\013friend_head\030\002 \001(\003\022\026\n\016friend_rq_h" +
+      "ead\030\003 \001(\003\022\024\n\014setting_head\030\004 \001(\003\022\021\n\tnode_" +
+      "addr\030\005 \001(\t\022\021\n\tnode_port\030\006 \001(\005\022\023\n\013server_" +
+      "time\030\007 \001(\003\"P\n\rIMHttpWrapper\022\r\n\005token\030\001 \002",
+      "(\t\022\021\n\tclient_id\030\002 \002(\t\022\017\n\007request\030\003 \002(\t\022\014" +
+      "\n\004data\030\004 \001(\014\"A\n\021SearchUserRequest\022\017\n\007key" +
+      "word\030\001 \002(\t\022\r\n\005fuzzy\030\002 \001(\005\022\014\n\004page\030\003 \001(\005\"" +
+      "(\n\020SearchUserResult\022\024\n\005entry\030\001 \003(\0132\005.Use" +
+      "r\"@\n\026GetChatroomInfoRequest\022\023\n\013chatroom_" +
+      "id\030\001 \002(\t\022\021\n\tupdate_dt\030\002 \001(\003\"\227\001\n\014Chatroom" +
+      "Info\022\r\n\005title\030\001 \002(\t\022\014\n\004desc\030\002 \001(\t\022\020\n\010por" +
+      "trait\030\003 \001(\t\022\024\n\014member_count\030\004 \001(\005\022\021\n\tcre" +
+      "ate_dt\030\005 \001(\003\022\021\n\tupdate_dt\030\006 \001(\003\022\r\n\005extra" +
+      "\030\007 \001(\t\022\r\n\005state\030\010 \001(\005\"F\n\034GetChatroomMemb",
+      "erInfoRequest\022\023\n\013chatroom_id\030\001 \002(\t\022\021\n\tma" +
+      "x_count\030\002 \001(\005\";\n\022ChatroomMemberInfo\022\024\n\014m" +
+      "ember_count\030\001 \001(\005\022\017\n\007members\030\002 \003(\t\"\026\n\010IN" +
+      "T64Buf\022\n\n\002id\030\001 \002(\003\"4\n\023NotifyRecallMessag" +
+      "e\022\n\n\002id\030\001 \002(\003\022\021\n\tfrom_user\030\002 \002(\t\"/\n\020Blac" +
+      "kUserRequest\022\013\n\003uid\030\001 \002(\t\022\016\n\006status\030\002 \002(" +
+      "\005\"\323\001\n\014RouteRequest\022\013\n\003app\030\001 \001(\t\022\020\n\010platf" +
+      "orm\030\002 \001(\005\022\021\n\tpush_type\030\003 \001(\005\022\023\n\013device_n" +
+      "ame\030\004 \001(\t\022\026\n\016device_version\030\005 \001(\t\022\022\n\npho" +
+      "ne_name\030\006 \001(\t\022\020\n\010language\030\007 \001(\t\022\024\n\014carri",
+      "er_name\030\010 \001(\t\022\023\n\013app_version\030\t \001(\t\022\023\n\013sd" +
+      "k_version\030\n \001(\t\"D\n\rRouteResponse\022\014\n\004host" +
+      "\030\001 \002(\t\022\021\n\tlong_port\030\002 \002(\005\022\022\n\nshort_port\030" +
+      "\003 \002(\005\"G\n\017GetTokenRequest\022\017\n\007user_id\030\001 \002(" +
+      "\t\022\021\n\tclient_id\030\002 \002(\t\022\020\n\010platform\030\003 \001(\005\"r" +
+      "\n\022LoadRemoteMessages\022#\n\014conversation\030\001 \002" +
+      "(\0132\r.Conversation\022\022\n\nbefore_uid\030\002 \002(\003\022\r\n" +
+      "\005count\030\003 \002(\005\022\024\n\014content_type\030\004 \003(\005\"a\n\020Mu" +
+      "ltiCastMessage\022\021\n\tfrom_user\030\001 \002(\t\022 \n\007con" +
+      "tent\030\002 \002(\0132\017.MessageContent\022\n\n\002to\030\003 \003(\t\022",
+      "\014\n\004line\030\004 \002(\005\"E\n\035RecallMultiCastMessageR" +
+      "equest\022\022\n\nmessage_id\030\001 \002(\003\022\020\n\010receiver\030\002" +
+      " \003(\t\"@\n\017AuthCodeRequest\022\021\n\ttarget_id\030\001 \002" +
+      "(\t\022\014\n\004type\030\002 \002(\005\022\014\n\004host\030\003 \002(\t\"o\n\030Applic" +
+      "ationConfigRequest\022\r\n\005appId\030\001 \002(\t\022\017\n\007app" +
+      "Type\030\002 \002(\005\022\021\n\ttimestamp\030\003 \002(\003\022\r\n\005nonce\030\004" +
+      " \002(\t\022\021\n\tsignature\030\005 \002(\tB/\n\025cn.wildfirech" +
+      "at.protoB\nWFCMessageZ\n./go;proto"
     };
     com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
       new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
@@ -67502,7 +67583,7 @@ public final class WFCMessage {
           internal_static_GroupInfo_fieldAccessorTable = new
             com.google.protobuf.GeneratedMessage.FieldAccessorTable(
               internal_static_GroupInfo_descriptor,
-              new java.lang.String[] { "TargetId", "Name", "Portrait", "Owner", "Type", "MemberCount", "Extra", "UpdateDt", "MemberUpdateDt", "Mute", "JoinType", "PrivateChat", "Searchable", "MaxMemberCount", "HistoryMessage", "SuperGroup", });
+              new java.lang.String[] { "TargetId", "Name", "Portrait", "Owner", "Type", "MemberCount", "Extra", "UpdateDt", "MemberUpdateDt", "Mute", "JoinType", "PrivateChat", "Searchable", "MaxMemberCount", "HistoryMessage", "SuperGroup", "Deleted", });
           internal_static_GroupMember_descriptor =
             getDescriptor().getMessageTypes().get(3);
           internal_static_GroupMember_fieldAccessorTable = new
diff --git a/distribution/src/main/resources/wildfirechat.conf b/distribution/src/main/resources/wildfirechat.conf
index 3509e295..5edeef73 100755
--- a/distribution/src/main/resources/wildfirechat.conf
+++ b/distribution/src/main/resources/wildfirechat.conf
@@ -203,6 +203,9 @@ group.visible_quit_or_kickoff_notification 0
 ## 是否禁止陌生人拉人入群，默认为false
 group.disable_stranger_invite false
 
+## 群组信息是否标记删除
+group.enable_mark_deletion false
+
 ## 隐藏用户信息属性类型，2是性别，3是电话号码，4是邮箱，5是地址，6是公司信息，7是社交账号，8是Extra信息。当需要隐藏多个时以英文逗号分开;
 ## 本配置是为了提高安全性，避免把对应信息同步到客户端，这样就能防止程序被破解从而拿到用户关键信息。仅对客户端有效，server api不受影响。
 ## 注意，修改本配置不会对已经同步的信息产生影响。