diff --git a/broker/src/main/java/io/moquette/imhandler/BroadcastMessageHandler.java b/broker/src/main/java/io/moquette/imhandler/BroadcastMessageHandler.java
index df98c0fe..22d13b59 100644
--- a/broker/src/main/java/io/moquette/imhandler/BroadcastMessageHandler.java
+++ b/broker/src/main/java/io/moquette/imhandler/BroadcastMessageHandler.java
@@ -33,7 +33,13 @@ public class BroadcastMessageHandler extends IMHandler<WFCMessage.Message> {
             }
 
             long timestamp = System.currentTimeMillis();
-            long messageId = MessageShardingUtil.generateId();
+            long messageId = 0;
+            try {
+                messageId = MessageShardingUtil.generateId();
+            } catch (Exception e) {
+                e.printStackTrace();
+                return ErrorCode.ERROR_CODE_SERVER_ERROR;
+            }
             message = message.toBuilder().setFromUser(fromUser).setMessageId(messageId).setServerTimestamp(timestamp).setConversation(WFCMessage.Conversation.newBuilder().setTarget(fromUser).setLine(message.getConversation().getLine()).setType(ProtoConstants.ConversationType.ConversationType_Private).build()).build();
 
             long count = saveAndBroadcast(fromUser, clientID, message);
diff --git a/broker/src/main/java/io/moquette/imhandler/GroupHandler.java b/broker/src/main/java/io/moquette/imhandler/GroupHandler.java
index 62670b33..2f603b25 100644
--- a/broker/src/main/java/io/moquette/imhandler/GroupHandler.java
+++ b/broker/src/main/java/io/moquette/imhandler/GroupHandler.java
@@ -32,9 +32,13 @@ abstract public class GroupHandler<T> extends IMHandler<T> {
             WFCMessage.Message.Builder builder = WFCMessage.Message.newBuilder().setContent(content).setServerTimestamp(timestamp);
             builder.setConversation(builder.getConversationBuilder().setType(ProtoConstants.ConversationType.ConversationType_Group).setTarget(targetId).setLine(line));
             builder.setFromUser(fromUser);
-            long messageId = MessageShardingUtil.generateId();
-            builder.setMessageId(messageId);
-            saveAndPublish(fromUser, null, builder.build(), false);
+            try {
+                long messageId = MessageShardingUtil.generateId();
+                builder.setMessageId(messageId);
+                saveAndPublish(fromUser, null, builder.build(), false);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
         }
     }
 
diff --git a/broker/src/main/java/io/moquette/imhandler/HandleFriendRequestHandler.java b/broker/src/main/java/io/moquette/imhandler/HandleFriendRequestHandler.java
index c6cb5bab..8e5980cb 100644
--- a/broker/src/main/java/io/moquette/imhandler/HandleFriendRequestHandler.java
+++ b/broker/src/main/java/io/moquette/imhandler/HandleFriendRequestHandler.java
@@ -32,50 +32,54 @@ public class HandleFriendRequestHandler extends IMHandler<WFCMessage.HandleFrien
 
             if (errorCode == ERROR_CODE_SUCCESS) {
                 if (!isAdmin && builder.getConversation() != null && request.getStatus() == ProtoConstants.FriendRequestStatus.RequestStatus_Accepted) {
-                    long messageId = MessageShardingUtil.generateId();
-                    long timestamp = System.currentTimeMillis();
-                    builder.setMessageId(messageId);
-                    builder.setServerTimestamp(timestamp);
-                    saveAndPublish(request.getTargetUid(), null, builder.build(), false);
+                    try {
+                        long messageId = MessageShardingUtil.generateId();
+                        long timestamp = System.currentTimeMillis();
+                        builder.setMessageId(messageId);
+                        builder.setServerTimestamp(timestamp);
+                        saveAndPublish(request.getTargetUid(), null, builder.build(), false);
 
-                    MemorySessionStore.Session session = m_sessionsStore.getSession(clientID);
-                    String language = "zh_CN";
-                    if (session != null && !StringUtil.isNullOrEmpty(session.getLanguage())) {
-                        language = session.getLanguage();
+                        MemorySessionStore.Session session = m_sessionsStore.getSession(clientID);
+                        String language = "zh_CN";
+                        if (session != null && !StringUtil.isNullOrEmpty(session.getLanguage())) {
+                            language = session.getLanguage();
+                        }
+                        WFCMessage.MessageContent.Builder contentBuilder = WFCMessage.MessageContent.newBuilder();
+                        if (m_messagesStore.isNewFriendWelcomeMessage()) {
+                            contentBuilder.setType(92);
+                        } else {
+                            contentBuilder.setType(90).setContent(I18n.getString(language, "Above_Greeting_Message"));
+                        }
+
+                        builder = WFCMessage.Message.newBuilder();
+                        builder.setFromUser(request.getTargetUid());
+                        builder.setConversation(WFCMessage.Conversation.newBuilder().setTarget(fromUser).setLine(0).setType(ProtoConstants.ConversationType.ConversationType_Private).build());
+                        builder.setContent(contentBuilder);
+                        timestamp = System.currentTimeMillis();
+                        builder.setServerTimestamp(timestamp);
+
+                        messageId = MessageShardingUtil.generateId();
+                        builder.setMessageId(messageId);
+                        saveAndPublish(request.getTargetUid(), null, builder.build(), false);
+
+                        if (m_messagesStore.isNewFriendWelcomeMessage()) {
+                            contentBuilder.setType(93);
+                        } else {
+                            contentBuilder.setContent(I18n.getString(language, "Friend_Can_Start_Chat"));
+                        }
+
+                        builder.setContent(contentBuilder);
+                        messageId = MessageShardingUtil.generateId();
+                        builder.setMessageId(messageId);
+                        timestamp = System.currentTimeMillis();
+                        builder.setServerTimestamp(timestamp);
+                        saveAndPublish(request.getTargetUid(), null, builder.build(), false);
+
+                        publisher.publishNotification(IMTopic.NotifyFriendTopic, request.getTargetUid(), heads[0]);
+                        publisher.publishNotification(IMTopic.NotifyFriendTopic, fromUser, heads[1]);
+                    } catch (Exception e) {
+                        e.printStackTrace();
                     }
-                    WFCMessage.MessageContent.Builder contentBuilder = WFCMessage.MessageContent.newBuilder();
-                    if (m_messagesStore.isNewFriendWelcomeMessage()) {
-                        contentBuilder.setType(92);
-                    } else {
-                        contentBuilder.setType(90).setContent(I18n.getString(language, "Above_Greeting_Message"));
-                    }
-
-                    builder = WFCMessage.Message.newBuilder();
-                    builder.setFromUser(request.getTargetUid());
-                    builder.setConversation(WFCMessage.Conversation.newBuilder().setTarget(fromUser).setLine(0).setType(ProtoConstants.ConversationType.ConversationType_Private).build());
-                    builder.setContent(contentBuilder);
-                    timestamp = System.currentTimeMillis();
-                    builder.setServerTimestamp(timestamp);
-
-                    messageId = MessageShardingUtil.generateId();
-                    builder.setMessageId(messageId);
-                    saveAndPublish(request.getTargetUid(), null, builder.build(), false);
-
-                    if (m_messagesStore.isNewFriendWelcomeMessage()) {
-                        contentBuilder.setType(93);
-                    } else {
-                        contentBuilder.setContent(I18n.getString(language, "Friend_Can_Start_Chat"));
-                    }
-
-                    builder.setContent(contentBuilder);
-                    messageId = MessageShardingUtil.generateId();
-                    builder.setMessageId(messageId);
-                    timestamp = System.currentTimeMillis();
-                    builder.setServerTimestamp(timestamp);
-                    saveAndPublish(request.getTargetUid(), null, builder.build(), false);
-
-                    publisher.publishNotification(IMTopic.NotifyFriendTopic, request.getTargetUid(), heads[0]);
-                    publisher.publishNotification(IMTopic.NotifyFriendTopic, fromUser, heads[1]);
                 }
             }
             return errorCode;
diff --git a/broker/src/main/java/io/moquette/imhandler/MultiCastMessageHandler.java b/broker/src/main/java/io/moquette/imhandler/MultiCastMessageHandler.java
index 2b33bcae..0b80430d 100644
--- a/broker/src/main/java/io/moquette/imhandler/MultiCastMessageHandler.java
+++ b/broker/src/main/java/io/moquette/imhandler/MultiCastMessageHandler.java
@@ -36,7 +36,13 @@ public class MultiCastMessageHandler extends IMHandler<WFCMessage.MultiCastMessa
         }
 
         long timestamp = System.currentTimeMillis();
-        long messageId = MessageShardingUtil.generateId();
+        long messageId = 0;
+        try {
+            messageId = MessageShardingUtil.generateId();
+        } catch (Exception e) {
+            e.printStackTrace();
+            return ErrorCode.ERROR_CODE_SERVER_ERROR;
+        }
         WFCMessage.Message message = WFCMessage.Message.newBuilder()
             .setContent(multiCastMessage.getContent())
             .setConversation(WFCMessage.Conversation.newBuilder().setTarget(fromUser).setType(ConversationType_Private).setLine(multiCastMessage.getLine()).build())
diff --git a/broker/src/main/java/io/moquette/imhandler/SendMessageHandler.java b/broker/src/main/java/io/moquette/imhandler/SendMessageHandler.java
index 05c7d1db..dd05b197 100644
--- a/broker/src/main/java/io/moquette/imhandler/SendMessageHandler.java
+++ b/broker/src/main/java/io/moquette/imhandler/SendMessageHandler.java
@@ -100,7 +100,13 @@ public class SendMessageHandler extends IMHandler<WFCMessage.Message> {
             }
 
             long timestamp = System.currentTimeMillis();
-            long messageId = MessageShardingUtil.generateId();
+            long messageId = 0;
+            try {
+                messageId = MessageShardingUtil.generateId();
+            } catch (Exception e) {
+                e.printStackTrace();
+                return ErrorCode.ERROR_CODE_SERVER_ERROR;
+            }
             message = message.toBuilder().setFromUser(fromUser).setMessageId(messageId).setServerTimestamp(timestamp).build();
 
             if (mForwardUrl != null) {
diff --git a/broker/src/main/java/win/liyufan/im/MessageShardingUtil.java b/broker/src/main/java/win/liyufan/im/MessageShardingUtil.java
index 65b97b82..6cd733aa 100644
--- a/broker/src/main/java/win/liyufan/im/MessageShardingUtil.java
+++ b/broker/src/main/java/win/liyufan/im/MessageShardingUtil.java
@@ -14,6 +14,7 @@ import java.util.Date;
 public class MessageShardingUtil {
     private static SpinLock mLock = new SpinLock();
     private static volatile int rotateId = 0;
+    private static volatile long timeId = 0;
     private static int nodeId = 0;
 
     private static int rotateIdWidth = 15;
@@ -33,13 +34,41 @@ public class MessageShardingUtil {
      * 所以时间限制是到2157/5/15（2的42次幂代表的时间 + (2018-1970)）。节点数限制是小于64，每台服务器每毫秒最多发送32768条消息
      * @return
      */
-    public static long generateId() {
+    public static long generateId() throws Exception {
         mLock.lock();
         rotateId = (rotateId + 1)&rotateIdMask;
         mLock.unLock();
 
         long id = System.currentTimeMillis() - T201801010000;
 
+        if (id > timeId) {
+            timeId = id;
+            rotateId = 1;
+        } else if(id == timeId) {
+            if (rotateId == (rotateIdMask - 1)) { //当前空间已经用完，等待下一个空间打开
+                while (id <= timeId) {
+                    id = System.currentTimeMillis() - T201801010000;
+                }
+                mLock.unLock();
+                return generateId();
+            }
+        } else { //id < timeId;
+            if (rotateId > (rotateIdMask -1)*9/10) { //空间已经接近用完
+                if (timeId - id < 3000) { //时间回拨小于3秒，等待时间赶上回拨之前记录
+                    while (id < timeId) {
+                        id = System.currentTimeMillis() - T201801010000;
+                    }
+                    mLock.unLock();
+                    return generateId();
+                } else { //时间回拨大于3秒，抛出异常，这段时间消息将不可用。
+                    mLock.unLock();
+                    throw new Exception("Time turn back " + (timeId - id) + " ms, it too long!!!");
+                }
+            } else {
+                id = timeId;
+            }
+
+        }
 
         id <<= nodeIdWidth;
         id += (nodeId & nodeIdMask);