diff --git a/bsp/microchip/common/applications/lwip_demo.c b/bsp/microchip/common/applications/lwip_demo.c
index 85c6a97d93..697f580249 100644
--- a/bsp/microchip/common/applications/lwip_demo.c
+++ b/bsp/microchip/common/applications/lwip_demo.c
@@ -76,7 +76,7 @@ static void tcpclient(void *arg)
     /* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
     if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
     {
-        /* Failed on creatinf socket */
+        /* Failed on creating socket */
         /* 创建socket失败 */
         LOG_E("Create socket error");
         goto __exit;
@@ -91,7 +91,7 @@ static void tcpclient(void *arg)
     /* 连接到服务端 */
     if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
     {
-        /*Failed on connecting to server*/
+        /* Failed on connecting to server */
         /* 连接失败 */
         LOG_E("Connect fail!");
         goto __exit;
@@ -123,14 +123,14 @@ static void tcpclient(void *arg)
         }
         else if (bytes_received == 0)
         {
-            /* Print warning message when recv function return 0 */
+            /* Print warning message when recv function returns 0 */
             /* 打印recv函数返回值为0的警告信息 */
-            LOG_W("Received warning, recv function return 0.");
+            LOG_W("Received warning, recv function returns 0.");
             continue;
         }
         else
         {
-            /* Receive data sucessfully and append '\0' at the end of message */
+            /* Receive data successfully and append '\0' at the end of message */
             /* 有接收到数据，把末端清零 */
             recv_data[bytes_received] = '\0';
 
@@ -160,9 +160,9 @@ static void tcpclient(void *arg)
         }
         else if (ret == 0)
         {
-            /* Print warning message when send function return 0 */
+            /* Print warning message when send function returns 0 */
             /* 打印send函数返回值为0的警告信息 */
-            LOG_W("Send warning, send function return 0.");
+            LOG_W("Send warning, send function returns 0.");
         }
     }
 
diff --git a/components/net/lwip/lwip-1.4.1/src/core/tcp_in.c b/components/net/lwip/lwip-1.4.1/src/core/tcp_in.c
index 4ec971ac0f..dc2a59444d 100644
--- a/components/net/lwip/lwip-1.4.1/src/core/tcp_in.c
+++ b/components/net/lwip/lwip-1.4.1/src/core/tcp_in.c
@@ -665,7 +665,7 @@ tcp_process(struct tcp_pcb *pcb)
         pcb->nrtx = 0;
       }
 
-      /* Call the user specified function to call when sucessfully
+      /* Call the user specified function to call when successfully
        * connected. */
       TCP_EVENT_CONNECTED(pcb, ERR_OK, err);
       if (err == ERR_ABRT) {
diff --git a/components/net/lwip/lwip-1.4.1/src/include/lwip/tcp_impl.h b/components/net/lwip/lwip-1.4.1/src/include/lwip/tcp_impl.h
index 173de44e44..4c2c8baec7 100644
--- a/components/net/lwip/lwip-1.4.1/src/include/lwip/tcp_impl.h
+++ b/components/net/lwip/lwip-1.4.1/src/include/lwip/tcp_impl.h
@@ -186,7 +186,7 @@ PACK_STRUCT_END
 /** Flags used on input processing, not on pcb->flags
 */
 #define TF_RESET     (u8_t)0x08U   /* Connection was reset. */
-#define TF_CLOSED    (u8_t)0x10U   /* Connection was sucessfully closed. */
+#define TF_CLOSED    (u8_t)0x10U   /* Connection was successfully closed. */
 #define TF_GOT_FIN   (u8_t)0x20U   /* Connection was closed by the remote end. */
 
 
diff --git a/components/net/lwip/lwip-2.0.3/doc/mqtt_client.txt b/components/net/lwip/lwip-2.0.3/doc/mqtt_client.txt
index 3e67defdc5..9d2ed0d767 100644
--- a/components/net/lwip/lwip-2.0.3/doc/mqtt_client.txt
+++ b/components/net/lwip/lwip-2.0.3/doc/mqtt_client.txt
@@ -148,7 +148,7 @@ void example_publish(mqtt_client_t *client, void *arg)
   }
 }
 
-/* Called when publish is complete either with sucess or failure */
+/* Called when publish is complete either with success or failure */
 static void mqtt_pub_request_cb(void *arg, err_t result)
 {
   if(result != ERR_OK) {
diff --git a/components/net/lwip/lwip-2.1.2/doc/mqtt_client.txt b/components/net/lwip/lwip-2.1.2/doc/mqtt_client.txt
index 7fd93a8edf..81c6d20abd 100644
--- a/components/net/lwip/lwip-2.1.2/doc/mqtt_client.txt
+++ b/components/net/lwip/lwip-2.1.2/doc/mqtt_client.txt
@@ -148,7 +148,7 @@ void example_publish(mqtt_client_t *client, void *arg)
   }
 }
 
-/* Called when publish is complete either with sucess or failure */
+/* Called when publish is complete either with success or failure */
 static void mqtt_pub_request_cb(void *arg, err_t result)
 {
   if(result != ERR_OK) {
diff --git a/documentation/network/network.md b/documentation/network/network.md
index 3499cec4f8..c9a137f4b1 100644
--- a/documentation/network/network.md
+++ b/documentation/network/network.md
@@ -605,7 +605,7 @@ void tcpclient(int argc, char**argv)
         else if (bytes_received == 0)
         {
             /* Print the recv function returns a warning message with a value of 0 */
-            rt_kprintf("\nReceived warning,recv function return 0.\r\n");
+            rt_kprintf("\nReceived warning,recv function returns 0.\r\n");
 
             continue;
         }
@@ -643,7 +643,7 @@ void tcpclient(int argc, char**argv)
         else if (ret == 0)
         {
             /* Print the send function returns a warning message with a value of 0 */
-            rt_kprintf("\n Send warning,send function return 0.\r\n");
+            rt_kprintf("\n Send warning,send function returns 0.\r\n");
         }
     }
     return;
diff --git a/examples/network/tcpclient.c b/examples/network/tcpclient.c
index 97ea690b6e..453910ec90 100644
--- a/examples/network/tcpclient.c
+++ b/examples/network/tcpclient.c
@@ -72,7 +72,7 @@ static void tcpclient(void *arg)
     /* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
     if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
     {
-        /* Failed on creatinf socket */
+        /* Failed on creating socket */
         /* 创建socket失败 */
         LOG_E("Create socket error");
         goto __exit;
@@ -87,7 +87,7 @@ static void tcpclient(void *arg)
     /* 连接到服务端 */
     if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
     {
-        /*Failed on connecting to server*/
+        /* Failed on connecting to server */
         /* 连接失败 */
         LOG_E("Connect fail!");
         goto __exit;
@@ -119,14 +119,14 @@ static void tcpclient(void *arg)
         }
         else if (bytes_received == 0)
         {
-            /* Print warning message when recv function return 0 */
+            /* Print warning message when recv function returns 0 */
             /* 打印recv函数返回值为0的警告信息 */
-            LOG_W("Received warning, recv function return 0.");
+            LOG_W("Received warning, recv function returns 0.");
             continue;
         }
         else
         {
-            /* Receive data sucessfully and append '\0' at the end of message */
+            /* Receive data successfully and append '\0' at the end of message */
             /* 有接收到数据，把末端清零 */
             recv_data[bytes_received] = '\0';
 
@@ -156,9 +156,9 @@ static void tcpclient(void *arg)
         }
         else if (ret == 0)
         {
-            /* Print warning message when send function return 0 */
+            /* Print warning message when send function returns 0 */
             /* 打印send函数返回值为0的警告信息 */
-            LOG_W("Send warning, send function return 0.");
+            LOG_W("Send warning, send function returns 0.");
         }
     }
 
diff --git a/examples/network/tcpsendpacket.c b/examples/network/tcpsendpacket.c
index da8bc4f524..f608f5173f 100644
--- a/examples/network/tcpsendpacket.c
+++ b/examples/network/tcpsendpacket.c
@@ -76,7 +76,7 @@ void tcp_senddata(const char *url, int port, int length)
         else if (result == 0)
         {
             /* 打印send函数返回值为0的警告信息 */
-            rt_kprintf("\n Send warning,send function return 0.\r\n");
+            rt_kprintf("\n Send warning,send function returns 0.\r\n");
         }
     }
 }
diff --git a/examples/network/tcpserver.c b/examples/network/tcpserver.c
index ff89595c15..6ec5f0e7a3 100644
--- a/examples/network/tcpserver.c
+++ b/examples/network/tcpserver.c
@@ -106,7 +106,7 @@ static void tcpserv(void *arg)
         /* Accept a request from client and the function is blocking */
         /* 接受一个客户端连接socket的请求，这个函数调用是阻塞式的 */
         connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size);
-        /* Return the socket connected sucessfully */
+        /* Return the socket connected successfully */
         /* 返回的是连接成功的socket */
         if (connected < 0)
         {
@@ -139,13 +139,13 @@ static void tcpserv(void *arg)
             }
             else if (bytes_received == 0)
             {
-                /* Print warning message when recv function return 0 */
+                /* Print warning message when recv function returns 0 */
                 /* 打印recv函数返回值为0的警告信息 */
-                LOG_W("Received warning, recv function return 0.");
+                LOG_W("Received warning, recv function returns 0.");
                 continue;
             }
             else
-            {   /* Receive data sucessfully and append '\0' at the end of message */
+            {   /* Receive data successfully and append '\0' at the end of message */
                 /* 有接收到数据，把末端清零 */
                 recv_data[bytes_received] = '\0';
                 if (strcmp(recv_data, "q") == 0 || strcmp(recv_data, "Q") == 0)
@@ -184,9 +184,9 @@ static void tcpserv(void *arg)
             }
             else if (ret == 0)
             {
-                /* Print warning message when send function return 0 */
+                /* Print warning message when send function returns 0 */
                 /* 打印send函数返回值为0的警告信息 */
-                LOG_W("Send warning, send function return 0.");
+                LOG_W("Send warning, send function returns 0.");
             }
         }
     }
diff --git a/examples/network/udpclient.c b/examples/network/udpclient.c
index 3ad27c76ff..d2ac265e27 100644
--- a/examples/network/udpclient.c
+++ b/examples/network/udpclient.c
@@ -50,7 +50,7 @@ static void udpclient(void *arg)
     /* 创建一个socket，类型是SOCK_DGRAM，UDP类型 */
     if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
     {
-        /* Failed on creatinf socket */
+        /* Failed on creating socket */
         LOG_E("Create socket error");
         return;
     }
@@ -71,7 +71,7 @@ static void udpclient(void *arg)
         /* 发送数据到服务远端 */
         sendto(sock, send_data, rt_strlen(send_data), 0,
                (struct sockaddr *)&server_addr, sizeof(struct sockaddr));
-        /* Thread sllep for 1 second */
+        /* Thread sleep for 1 second */
         /* 线程休眠一段时间 */
         rt_thread_mdelay(1000);
         /* count decrease 1 */
diff --git a/examples/network/udpserver.c b/examples/network/udpserver.c
index 33442a72ed..89a17f2cc3 100644
--- a/examples/network/udpserver.c
+++ b/examples/network/udpserver.c
@@ -107,7 +107,7 @@ static void udpserv(void *paramemter)
         }
         else if (bytes_read == 0)
         {
-            LOG_W("Received warning, recv function return 0.");
+            LOG_W("Received warning, recv function returns 0.");
             continue;
         }
         else
diff --git a/examples/utest/README.md b/examples/utest/README.md
index bde3bd4b80..6e24632b7c 100644
--- a/examples/utest/README.md
+++ b/examples/utest/README.md
@@ -2,7 +2,7 @@
 
 ## 简介
 
-为了保证某一部分代码的质量，通常可以通过编写测试用例的方式，验证此代码的功能。为了保证 RT-Thread 相关仓库的代码质量，我们基于 utest 框架搭建了一套简易的自动化测试环境。有兴趣，有精力的小伙伴可以利用这套机制完善自己的代码检查。如果有意愿让社区上更多的小伙伴收益，也可以在提交代码的时候，把对应的测试用例也提交上来。
+为了保证某一部分代码的质量，通常可以通过编写测试用例的方式，验证此代码的功能。为了保证 RT-Thread 相关仓库的代码质量，我们基于 utest 框架搭建了一套简易的自动化测试环境。有兴趣，有精力的小伙伴可以利用这套机制完善自己的代码检查。如果有意愿让社区上更多的小伙伴受益，也可以在提交代码的时候，把对应的测试用例也提交上来。
 
 ## 目录结构
 
@@ -15,7 +15,7 @@
 
 ### 1. 编写测试用例
 
-参考已有的测试用例在 [examples\utest\testcases](./testcases) 目录下添加自己的测试用例。测试用例的编写方法参考文档中心《utest 测试框架》章节。
+参考已有的测试用例在 [examples\utest\testcases](./testcases) 目录下添加自己的测试用例。测试用例的编写方法参考文档中心[《utest 测试框架》章节](https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-standard/programming-manual/utest/utest)。
 
 ### 2. 本地测试
 
@@ -70,4 +70,4 @@ CONFIG_RT_USING_MEMHEAP=y
 - {UTEST: "components/utest", RTT_BSP: "bsp/qemu-vexpress-a9",   QEMU_ARCH: "arm", QEMU_MACHINE: "vexpress-a9", CONFIG_FILE: "utest_self/self.conf", SD_FILE: "sd.bin"}
 ```
 
-3. 向 RT-Thread 主仓库提交合并请求。
\ No newline at end of file
+3. 向 RT-Thread 主仓库提交合并请求。
diff --git a/examples/utest/testcases/posix/pthread_h/functions/testfrmw/threads_scenarii.c b/examples/utest/testcases/posix/pthread_h/functions/testfrmw/threads_scenarii.c
index 3f5a9845cf..f4976388e0 100644
--- a/examples/utest/testcases/posix/pthread_h/functions/testfrmw/threads_scenarii.c
+++ b/examples/utest/testcases/posix/pthread_h/functions/testfrmw/threads_scenarii.c
@@ -246,7 +246,7 @@ static void scenar_init(void)
                        " PTHREAD_CREATE_JOINABLE");
         }
 #if VERBOSE > 4
-        output("Detach state was set sucessfully\n");
+        output("Detach state was set successfully\n");
 #endif
 
         /* Sched related attributes */
@@ -269,7 +269,7 @@ static void scenar_init(void)
                 UNRESOLVED(ret, "Unable to set inheritsched"
                        " attribute");
 #if VERBOSE > 4
-            output("inheritsched state was set sucessfully\n");
+            output("inheritsched state was set successfully\n");
 #endif
         }
 #if VERBOSE > 4
@@ -292,7 +292,7 @@ static void scenar_init(void)
                        " sched policy");
 #if VERBOSE > 4
             if (scenarii[i].schedpolicy)
-                output("Sched policy was set sucessfully\n");
+                output("Sched policy was set successfully\n");
             else
                 output("Sched policy untouched\n");
 #endif
@@ -323,7 +323,7 @@ static void scenar_init(void)
                        "Failed to set the sched param");
 
 #if VERBOSE > 4
-            output("Sched param was set sucessfully to %i\n",
+            output("Sched param was set successfully to %i\n",
                    sp.sched_priority);
         } else {
             output("Sched param untouched\n");
diff --git a/examples/utest/testcases/posix/stdio_h/functions/fclose_tc.c b/examples/utest/testcases/posix/stdio_h/functions/fclose_tc.c
index c182283bbd..fef2235d4b 100644
--- a/examples/utest/testcases/posix/stdio_h/functions/fclose_tc.c
+++ b/examples/utest/testcases/posix/stdio_h/functions/fclose_tc.c
@@ -16,7 +16,7 @@ static int fclose_entry(void)
     }
     else 
     {
-        printf("fclose sucess \n");
+        printf("fclose success \n");
     }
     return 0;
 }
diff --git a/tools/sconsui.py b/tools/sconsui.py
index 2def194cfa..998643b6b6 100644
--- a/tools/sconsui.py
+++ b/tools/sconsui.py
@@ -291,7 +291,7 @@ class SconsUI():
 
         setting.close()
         tkMessageBox.showinfo("RT-Thread SCons UI",
-                    "Save setting sucessfully")
+                    "Save setting successfully")
 
     def setup_building_ui(self, frame):
         padding = ttk.Frame(frame)