diff --git a/common/src/main/java/cn/wildfirechat/common/APIPath.java b/common/src/main/java/cn/wildfirechat/common/APIPath.java
index 9fddf65e..c06510ce 100644
--- a/common/src/main/java/cn/wildfirechat/common/APIPath.java
+++ b/common/src/main/java/cn/wildfirechat/common/APIPath.java
@@ -60,6 +60,7 @@ public interface APIPath {
     String Msg_ConvRead = "/admin/message/conv_read";
     String Msg_Delivery = "/admin/message/delivery";
     String Conversation_Delete = "/admin/conversation/delete";
+    String Msg_Clear_By_User = "/admin/message/clear_by_user";
 
     String Create_Group = "/admin/group/create";
     String Group_Dismiss = "/admin/group/del";
diff --git a/common/src/main/java/cn/wildfirechat/pojos/OutputBooleanValue.java b/common/src/main/java/cn/wildfirechat/pojos/OutputBooleanValue.java
old mode 100755
new mode 100644
index 4c489be6..2034936a
--- a/common/src/main/java/cn/wildfirechat/pojos/OutputBooleanValue.java
+++ b/common/src/main/java/cn/wildfirechat/pojos/OutputBooleanValue.java
@@ -1,21 +1,5 @@
-/*
- * 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;
 
-
-import cn.wildfirechat.proto.WFCMessage;
-import io.netty.util.internal.StringUtil;
-
-import java.util.ArrayList;
-import java.util.List;
-
 public class OutputBooleanValue {
     public boolean value;
 }
-
diff --git a/sdk/src/main/java/cn/wildfirechat/sdk/MessageAdmin.java b/sdk/src/main/java/cn/wildfirechat/sdk/MessageAdmin.java
index 8b846d2b..63aa86b8 100644
--- a/sdk/src/main/java/cn/wildfirechat/sdk/MessageAdmin.java
+++ b/sdk/src/main/java/cn/wildfirechat/sdk/MessageAdmin.java
@@ -40,6 +40,12 @@ public class MessageAdmin {
         return AdminHttpUtils.httpJsonPost(path, deleteMessageData, Void.class);
     }
 
+    public static IMResult<Void> clearUserMessages(String userId, Conversation conversation, long fromTime, long toTime) throws Exception {
+        String path = APIPath.Msg_Clear_By_User;
+        InputClearUserMessages clearUserMessages = new InputClearUserMessages(userId, conversation, fromTime, toTime);
+        return AdminHttpUtils.httpJsonPost(path, clearUserMessages, Void.class);
+    }
+
     public static IMResult<Void> updateMessageContent(String operator, long messageUid, MessagePayload payload, boolean distribute) throws Exception {
         String path = APIPath.Msg_Update;
         UpdateMessageContentData updateMessageContentData = new UpdateMessageContentData();