diff --git a/gradle.properties b/gradle.properties
index 5688a95..5f13a17 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
 kotlin.code.style=official
 
-libVersion=1.8.6
\ No newline at end of file
+libVersion=1.8.7
\ No newline at end of file
diff --git a/src/main/kotlin/cn/rtast/rob/util/ob/MessageHandler.kt b/src/main/kotlin/cn/rtast/rob/util/ob/MessageHandler.kt
index 0efcf06..8f65544 100644
--- a/src/main/kotlin/cn/rtast/rob/util/ob/MessageHandler.kt
+++ b/src/main/kotlin/cn/rtast/rob/util/ob/MessageHandler.kt
@@ -57,8 +57,8 @@ object MessageHandler {
                                 return@forEach
                             }
                         }
-                        commandManager.handleGroup(listener, msg)
                         listener.onGroupMessage(msg, message)
+                        commandManager.handleGroup(listener, msg)
                     }
 
                     MessageType.private -> {
@@ -69,8 +69,8 @@ object MessageHandler {
                                 return@forEach
                             }
                         }
-                        commandManager.handlePrivate(listener, msg)
                         listener.onPrivateMessage(msg, message)
+                        commandManager.handlePrivate(listener, msg)
                     }
 
                     null -> listener.onMessage(message)
diff --git a/src/main/kotlin/cn/rtast/rob/util/ws/WsClient.kt b/src/main/kotlin/cn/rtast/rob/util/ws/WsClient.kt
index 6a57e8a..40dce11 100644
--- a/src/main/kotlin/cn/rtast/rob/util/ws/WsClient.kt
+++ b/src/main/kotlin/cn/rtast/rob/util/ws/WsClient.kt
@@ -30,6 +30,7 @@ internal class WsClient(
     private val reconnectInterval = 5000L
     private var isConnected = false
     private val coroutineScope = CoroutineScope(Dispatchers.IO)
+    private val channelCoroutineScope = CoroutineScope(Dispatchers.IO)
     private val messageChannel = Channel<String>(messageQueueLimit)
     private val scheduler = Executors.newScheduledThreadPool(1)
 
@@ -44,8 +45,11 @@ internal class WsClient(
         }
     }
 
+    /**
+     * 每次接收到消息时都会向channel中发送数据等待消费
+     */
     override fun onMessage(message: String) {
-        coroutineScope.launch {
+        channelCoroutineScope.launch {
             messageChannel.send(message)
         }
     }
@@ -75,10 +79,17 @@ internal class WsClient(
         }, reconnectInterval, TimeUnit.MILLISECONDS)
     }
 
+    /**
+     * 启动一个线程用于消费管道(Channel)内的消息
+     * 每次消费消息都会开一个线程用于处理这条消息
+     * 消费完成之后线程会自动回到线程池等下下次启动
+     */
     private fun processMessages() {
         coroutineScope.launch {
             for (message in messageChannel) {
-                MessageHandler.onMessage(listener, message)
+                coroutineScope.launch {
+                    MessageHandler.onMessage(listener, message)
+                }
             }
         }
     }
diff --git a/src/main/kotlin/cn/rtast/rob/util/ws/WsServer.kt b/src/main/kotlin/cn/rtast/rob/util/ws/WsServer.kt
index 1d18d06..1b7d5c1 100644
--- a/src/main/kotlin/cn/rtast/rob/util/ws/WsServer.kt
+++ b/src/main/kotlin/cn/rtast/rob/util/ws/WsServer.kt
@@ -26,6 +26,7 @@ internal class WsServer(
 ) : WebSocketServer(InetSocketAddress(port)) {
 
     private val coroutineScope = CoroutineScope(Dispatchers.IO)
+    private val channelCoroutineScope = CoroutineScope(Dispatchers.IO)
     private val messageChannel = Channel<String>(messageQueueLimit)
 
     init {
@@ -55,8 +56,8 @@ internal class WsServer(
     }
 
     override fun onMessage(conn: WebSocket, message: String) {
-        coroutineScope.launch {
-            MessageHandler.onMessage(listener, message)
+        channelCoroutineScope.launch {
+            messageChannel.send(message)
         }
     }
 
@@ -72,14 +73,12 @@ internal class WsServer(
         }
     }
 
-    /**
-     * launch a coroutine to process queued messages
-     */
     private fun processMessages() {
         coroutineScope.launch {
-            messageChannel.cancel()
             for (message in messageChannel) {
-                MessageHandler.onMessage(listener, message)
+                coroutineScope.launch {
+                    MessageHandler.onMessage(listener, message)
+                }
             }
         }
     }
diff --git a/src/test/kotlin/Common.kt b/src/test/kotlin/Common.kt
index d432fb3..7f19788 100644
--- a/src/test/kotlin/Common.kt
+++ b/src/test/kotlin/Common.kt
@@ -9,6 +9,7 @@ import cn.rtast.rob.entity.GroupMessage
 import cn.rtast.rob.util.BaseCommand
 import cn.rtast.rob.util.ob.CQMessageChain
 import cn.rtast.rob.util.ob.OneBotListener
+import kotlinx.coroutines.delay
 
 class EchoCommand : BaseCommand() {
     // A simple echo message command
@@ -21,4 +22,14 @@ class EchoCommand : BaseCommand() {
             .build()
         listener.sendGroupMessage(message.groupId, msg)
     }
+}
+
+class DelayCommand : BaseCommand() {
+    override val commandNames = listOf("d", "/d")
+
+    override suspend fun executeGroup(listener: OneBotListener, message: GroupMessage, args: List<String>) {
+        delay(3000L)
+        message.reply("延迟3秒")
+        println("延迟3秒")
+    }
 }
\ No newline at end of file
diff --git a/src/test/kotlin/TestClient.kt b/src/test/kotlin/TestClient.kt
index 43b9d9b..f964441 100644
--- a/src/test/kotlin/TestClient.kt
+++ b/src/test/kotlin/TestClient.kt
@@ -16,12 +16,9 @@ fun main() {
         override suspend fun onGroupMessage(message: GroupMessage, json: String) {
             message.sender.ban(1)
         }
-
-        override suspend fun onGroupFileUpload(event: FileEvent) {
-            event.saveTo(".")
-        }
     })
     rob.commandManager.register(EchoCommand())  // not a suspend function
+    rob.commandManager.register(DelayCommand())  // not a suspend function
 //    rob.action.sendGroupMessage(114514, "1919810")  // send a message in global scope
     rob.addListeningGroups(985927054, 114514)  // set listening groups, set empty to listen all groups' event
 }
\ No newline at end of file