diff --git a/docs/API_reference/en/networklib/umqtt.md b/docs/API_reference/en/networklib/umqtt.md
index 40e42e56b6450f9133e0343275e661d92ffd9da0..375778c3b820aa7718c71d5f390a542d501b11ea 100644
--- a/docs/API_reference/en/networklib/umqtt.md
+++ b/docs/API_reference/en/networklib/umqtt.md
@@ -15,7 +15,7 @@ QoS2 – Only once. Highest level. The message is guaranteed to be received by t
 ### `MQTTClient`
 
 ```python
-MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=0, ssl=False, ssl_params={},reconn=True,version=4)
+MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=60, ssl=False, ssl_params={},reconn=True,version=4)
 ```
 
 Creates MQTT clients.
@@ -29,7 +29,7 @@ Creates MQTT clients.
 | port       | Integer | Server port (optional). Default value: 1883. The default port of MQTT over SSL/TLS is 8883. |
 | user       | String  | Username registered on the server (optional).                |
 | password   | String  | Password registered on the server (optional).                |
-| keepalive  | Integer | Timeout of keep-alive (optional). Default value: 0. Unit: s. |
+| keepalive  | Integer | Timeout of keep-alive (optional). Default value: 60. Unit: s. |
 | ssl        | bool    | Enable or disable SSL/TSL encryption.                        |
 | ssl_params | String  | SSL/TLS parameter (optional).                                |
 | reconn     | bool    | Enable or disable the internal reconnection mechanism (optional). Default value: True (enable). |
@@ -251,6 +251,8 @@ MQTTClient.wait_msg()
 
 Blocks waiting for a message response from the MQTT server.
 
+>If this method is called in a thread, it is necessary to ensure that the thread stack created is >= 16K. For details, please refer to the mqtt reconnection sample code.
+
 * Parameter
 
 None
@@ -381,6 +383,7 @@ import net
 import _thread
 import checkNet
 import dataCall
+import uos
 from umqtt import MQTTClient
 
 PROJECT_NAME = "QuecPython_MQTT_example"
@@ -552,7 +555,18 @@ class MqttClient():
                     return -1
 
     def loop_forever(self):
+        task_stacksize =_thread.stack_size()
+        name,platform = uos.uname()[1].split("=",1)
+        if platform == "EC600E" or platform == "EC800E":
+            _thread.stack_size(8 * 1024)
+        elif platform == "FCM362K":
+            _thread.stack_size(3 * 1024)
+        else:
+            _thread.stack_size(16 * 1024)
+        # Before creating a thread, modify the thread stack space according to the platform.
         _thread.start_new_thread(self.__listen, ())
+        # After the thread is created successfully, the platform thread stack default size is restored.
+        _thread.stack_size(task_stacksize)
 
 if __name__ == '__main__':
     '''
diff --git a/docs/API_reference/zh/networklib/umqtt.md b/docs/API_reference/zh/networklib/umqtt.md
index 5358e766c9e8c588510a704b1de2813b5668d183..ca074da9cd1f83d55175bf07e73b57614c40fdc2 100644
--- a/docs/API_reference/zh/networklib/umqtt.md
+++ b/docs/API_reference/zh/networklib/umqtt.md
@@ -15,7 +15,7 @@ QoS2 – 有且仅有一次，是最高级别；保证消息送达且仅送达
 ### `umqtt.MQTTClient`
 
 ```python
-class umqtt.MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=0, ssl=False, ssl_params={},reconn=True,version=4)
+class umqtt.MQTTClient(client_id, server, port=0, user=None, password=None, keepalive=60, ssl=False, ssl_params={},reconn=True,version=4)
 ```
 
 构建mqtt连接对象。
@@ -32,7 +32,7 @@ class umqtt.MQTTClient(client_id, server, port=0, user=None, password=None, keep
 
 * `password` - （可选) 在服务器上注册的密码，字符串类型。
 
-* `keepalive` - （可选）客户端的keepalive超时值，整数类型，默认为0。
+* `keepalive` - （可选）客户端的keepalive超时值，整数类型，默认为60。
 
 * `ssl` - （可选）是否使能 SSL/TLS 支持，布尔值类型。
 
@@ -222,6 +222,7 @@ MQTTClient.wait_msg()
 
 阻塞等待服务器消息响应。
 
+>该方法如果在线程中调用时，需保证创建线程栈空间>=16K,具体请参照mqtt重连示例代码.
 
 ### `MQTTClient.get_mqttsta`
 
@@ -339,6 +340,7 @@ import net
 import _thread
 import checkNet
 import dataCall
+import uos
 from umqtt import MQTTClient
 
 PROJECT_NAME = "QuecPython_MQTT_example"
@@ -510,7 +512,18 @@ class MqttClient():
                     return -1
 
     def loop_forever(self):
+        task_stacksize =_thread.stack_size()
+        name,platform = uos.uname()[1].split("=",1)
+        if platform == "EC600E" or platform == "EC800E":
+            _thread.stack_size(8 * 1024)
+        elif platform == "FCM362K":
+            _thread.stack_size(3 * 1024)
+        else:
+            _thread.stack_size(16 * 1024)
+        # 创建线程之前，按照平台，修改线程栈空间。
         _thread.start_new_thread(self.__listen, ())
+        # 线程创建成功后，恢复平台线程栈默认大小。
+        _thread.stack_size(task_stacksize)
 
 if __name__ == '__main__':
     '''
diff --git a/docs/Application_guide/zh/network-comm/net-protocols/README.md b/docs/Application_guide/zh/network-comm/net-protocols/README.md
deleted file mode 100644
index b678e1880dade231caf5f8efef0d58980ed5e76b..0000000000000000000000000000000000000000
--- a/docs/Application_guide/zh/network-comm/net-protocols/README.md
+++ /dev/null
@@ -1,10 +0,0 @@
-# 网络协议应用指导
-
-该部分文档主要包含 TCP/UDP、HTTP、MQTT、FTP 等协议的应用指导，文档内容囊括协议讲解、应用场景、应用流程、疑难解答等部分，深入浅出地对网络应用协议做了讲解。
-
-该部分文档的目录如下：
-
-- [TCP/UDP 协议应用指导](./tcp-udp.md)
-- [HTTP 协议应用指导](./http.md)
-- [MQTT 协议应用指导](./mqtt.md)
-- [FTP 协议应用指导](./ftp.md)