diff --git a/broker/src/main/java/io/moquette/persistence/MemorySessionStore.java b/broker/src/main/java/io/moquette/persistence/MemorySessionStore.java
index bd3e83e2..b9a3bac3 100755
--- a/broker/src/main/java/io/moquette/persistence/MemorySessionStore.java
+++ b/broker/src/main/java/io/moquette/persistence/MemorySessionStore.java
@@ -531,7 +531,7 @@ public class MemorySessionStore implements ISessionsStore {
             if (session.getUsername().equals(username)) {
                 return session;
             } else {
-                cleanSession(clientID);
+                cleanSession(null, clientID);
             }
         }
         return null;
@@ -739,9 +739,9 @@ public class MemorySessionStore implements ISessionsStore {
 
 
     @Override
-    public void disableSession(String clientId) {
+    public void disableSession(String userId, String clientId) {
         Session session = sessions.get(clientId);
-        if (session != null && session.getDeleted() == 0) {
+        if (session != null && session.getDeleted() == 0 && (userId == null || session.getUsername().equals(userId))) {
             databaseStore.updateSessionDeleted(session.getUsername(), clientId, 1);
             ConcurrentSkipListSet<String> sessionSet = getUserSessionSet(session.username);
             sessionSet.remove(clientId);
@@ -750,7 +750,7 @@ public class MemorySessionStore implements ISessionsStore {
     }
 
     @Override
-    public void cleanSession(String clientID) {
+    public void cleanSession(String userId, String clientID) {
         LOG.info("Fooooooooo <{}>", clientID);
 
         Session session = sessions.get(clientID);
@@ -758,6 +758,11 @@ public class MemorySessionStore implements ISessionsStore {
             LOG.error("Can't find the session for client <{}>", clientID);
             return;
         }
+
+        if(userId != null && !session.getUsername().equals(userId)) {
+            return;
+        }
+
         ConcurrentSkipListSet<String> sessionSet = getUserSessionSet(session.username);
         sessionSet.remove(clientID);
 
diff --git a/broker/src/main/java/io/moquette/spi/ClientSession.java b/broker/src/main/java/io/moquette/spi/ClientSession.java
index 653cddf2..22a48bfd 100755
--- a/broker/src/main/java/io/moquette/spi/ClientSession.java
+++ b/broker/src/main/java/io/moquette/spi/ClientSession.java
@@ -109,19 +109,19 @@ public class ClientSession {
     }
 
 
-    public void disconnect(boolean cleanSession, boolean disableSession) {
+    public void disconnect(String userId, boolean cleanSession, boolean disableSession) {
         if (cleanSession) {
             LOG.info("Client disconnected. Removing its subscriptions. ClientId={}", clientID);
             // cleanup topic subscriptions
-            cleanSession();
+            cleanSession(userId);
         } else if(disableSession) {
             LOG.info("Client disconnected. disable session. ClientId={}", clientID);
-            m_sessionsStore.disableSession(this.clientID);
+            m_sessionsStore.disableSession(userId, this.clientID);
         }
     }
 
-    public void cleanSession() {
-        m_sessionsStore.cleanSession(this.clientID);
+    public void cleanSession(String userId) {
+        m_sessionsStore.cleanSession(userId, this.clientID);
     }
 
 
diff --git a/broker/src/main/java/io/moquette/spi/ISessionsStore.java b/broker/src/main/java/io/moquette/spi/ISessionsStore.java
index 324d6500..11afe1d0 100755
--- a/broker/src/main/java/io/moquette/spi/ISessionsStore.java
+++ b/broker/src/main/java/io/moquette/spi/ISessionsStore.java
@@ -150,8 +150,8 @@ public interface ISessionsStore {
      */
     int getSecondPhaseAckPendingMessages(String clientID);
 
-    void disableSession(String clientId);
-    void cleanSession(String clientID);
+    void disableSession(String userId, String clientId);
+    void cleanSession(String userId, String clientID);
 
     boolean isMultiEndpointSupported();
 
diff --git a/broker/src/main/java/io/moquette/spi/impl/ProtocolProcessor.java b/broker/src/main/java/io/moquette/spi/impl/ProtocolProcessor.java
index f09217bf..265466cd 100755
--- a/broker/src/main/java/io/moquette/spi/impl/ProtocolProcessor.java
+++ b/broker/src/main/java/io/moquette/spi/impl/ProtocolProcessor.java
@@ -44,12 +44,14 @@ import io.netty.handler.timeout.IdleStateHandler;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import win.liyufan.im.HttpUtils;
+import win.liyufan.im.IMTopic;
 import win.liyufan.im.Utility;
 
 import java.util.*;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
+import static cn.wildfirechat.common.ErrorCode.ERROR_CODE_SUCCESS;
 import static io.moquette.spi.impl.InternalRepublisher.createPublishForQos;
 import static cn.wildfirechat.common.IMExceptionEvent.EventType.EVENT_CALLBACK_Exception;
 import static io.moquette.spi.impl.Utils.readBytesAndRewind;
@@ -582,7 +584,7 @@ public class ProtocolProcessor {
 
         //disconnect the session
 
-        m_sessionsStore.sessionForClient(clientID).disconnect(isDup, isRetain);
+        m_sessionsStore.sessionForClient(clientID).disconnect(session.getUsername(), isDup, isRetain);
     }
 
 
diff --git a/broker/src/main/java/win/liyufan/im/IMTopic.java b/broker/src/main/java/win/liyufan/im/IMTopic.java
index da638b1b..6d1cf98b 100755
--- a/broker/src/main/java/win/liyufan/im/IMTopic.java
+++ b/broker/src/main/java/win/liyufan/im/IMTopic.java
@@ -80,4 +80,6 @@ public interface IMTopic {
 
     String LoadRemoteMessagesTopic = "LRM";
     String KickoffPCClientTopic = "KPCC";
+
+    String ClearSessionTopic = "CST";
 }