diff --git a/docs/doc/communication/NB-IOT.md b/docs/doc/communication/NB-IOT.md
index 3958123..f7e0ac3 100644
--- a/docs/doc/communication/NB-IOT.md
+++ b/docs/doc/communication/NB-IOT.md
@@ -575,7 +575,7 @@ BC28 采用更易于焊接的 LCC 封装，可通过标准 SMT 设备实现模
 
 [\*] Enable NB-IOT  ---></br>
 &ensp;&ensp;&ensp;&ensp;--- Enable NB-IOT</br>
-&ensp;&ensp;&ensp;&ensp;[\*]   Quectel BC26  ---></br>
+&ensp;&ensp;&ensp;&ensp;[\*]   Quectel BC28  ---></br>
 &ensp;&ensp;&ensp;&ensp;[ ]   Gosuncn ME3616</br>
 &ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;[ ]   Enable initialize by thread</br>
 &ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;[\*]   Enable sample   ---> （是否编译测试例程）</br>
@@ -584,5 +584,5 @@ BC28 采用更易于焊接的 LCC 封装，可通过标准 SMT 设备实现模
 &ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;(uart3) AT client device name  ---> （模块连接的UART名字，取决于模块和主板的连接方式）</br>
 &ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;&ensp;(1024)  The maximum length of receive line buffer  ---> （缓存大小，建议在1K以上）</br>
 <div>
-    <img src = "./imagesrc/bc26_CodeTree.png" alt="bc26_CodeTree" width =300 >
+    <img src = "./imagesrc/bc-28_codetree.png" alt="bc-28_codetree" width =300 >
 </div>
\ No newline at end of file
diff --git a/docs/doc/communication/WiFi.md b/docs/doc/communication/WiFi.md
index 2da1330..72d73ed 100644
--- a/docs/doc/communication/WiFi.md
+++ b/docs/doc/communication/WiFi.md
@@ -67,4 +67,31 @@ ESP8266芯片是一款串口转无线模芯片，内部自带固件，用户操
 
 <div>
     <img src = "./imagesrc/esp8266_CodeTree.png" alt="esp8266_CodeTree" width =300 >
-</div>
\ No newline at end of file
+</div></br></br>
+
+
+## 连接方式
+<div style="display: flex;justify-content: center;align-items: center;">
+    <img src = "./imagesrc/esp8266_link.png" alt="esp8266 link" width =40% max-width= 40% >
+    </br>
+</div></br></br>
+
+## 用户接口
+```c
+static const struct netdev_ops esp8266_netdev_ops{
+    
+    esp8266_netdev_set_up,
+    esp8266_netdev_set_down,
+
+    esp8266_netdev_set_addr_info,
+    esp8266_netdev_set_dns_server,
+    esp8266_netdev_set_dhcp,
+
+    #ifdef NETDEV_USING_PING
+        esp8266_netdev_ping,
+    #endif
+    #ifdef NETDEV_USING_STAT
+        esp8266_netdev_stat,
+    #endif
+}
+```
\ No newline at end of file
diff --git a/docs/doc/communication/imagesrc/bc-28_codetree.png b/docs/doc/communication/imagesrc/bc-28_codetree.png
new file mode 100644
index 0000000..4c33734
Binary files /dev/null and b/docs/doc/communication/imagesrc/bc-28_codetree.png differ
diff --git a/docs/doc/communication/imagesrc/bc26_CodeTree.png b/docs/doc/communication/imagesrc/bc26_CodeTree.png
deleted file mode 100644
index 43ed04e..0000000
Binary files a/docs/doc/communication/imagesrc/bc26_CodeTree.png and /dev/null differ
diff --git a/docs/doc/communication/imagesrc/esp8266_link.png b/docs/doc/communication/imagesrc/esp8266_link.png
new file mode 100644
index 0000000..d087f24
Binary files /dev/null and b/docs/doc/communication/imagesrc/esp8266_link.png differ
diff --git a/docs/doc/kernel/tmr.md b/docs/doc/kernel/tmr.md
index 3859130..bb81570 100644
--- a/docs/doc/kernel/tmr.md
+++ b/docs/doc/kernel/tmr.md
@@ -98,7 +98,6 @@ typedef struct xs_Timer *xs_timer_x;
 #define TRIGGE_WAY_ONCE      (1 << 0)
 #define TRIGGE_WAY_PERIODIC  (1 << 1)
 
-```c
 xs_int32 xs_KTimerCreate(xs_uint8 trigge_way，void (*func_callback)(void *param)，void *func_param， xs_tick_x ticks);
 ```
 该函数用于创建一个内核软件定时器，并返回创建成功的软件定时器的ID，ID默认范围0-255，可配置。