diff --git a/components/finsh/cmd.c b/components/finsh/cmd.c
index 2d67c85fe35..dc5eaad34e2 100644
--- a/components/finsh/cmd.c
+++ b/components/finsh/cmd.c
@@ -940,64 +940,64 @@ static int cmd_list(int argc, char **argv)
 {
     if(argc == 2)
     {
-        if(strcmp(argv[1], "thread") == 0)
+        if(rt_strcmp(argv[1], "thread") == 0)
         {
             list_thread();
         }
-        else if(strcmp(argv[1], "timer") == 0)
+        else if(rt_strcmp(argv[1], "timer") == 0)
         {
             list_timer();
         }
 #ifdef RT_USING_SEMAPHORE
-        else if(strcmp(argv[1], "sem") == 0)
+        else if(rt_strcmp(argv[1], "sem") == 0)
         {
             list_sem();
         }
 #endif /* RT_USING_SEMAPHORE */
 #ifdef RT_USING_EVENT
-        else if(strcmp(argv[1], "event") == 0)
+        else if(rt_strcmp(argv[1], "event") == 0)
         {
             list_event();
         }
 #endif /* RT_USING_EVENT */
 #ifdef RT_USING_MUTEX
-        else if(strcmp(argv[1], "mutex") == 0)
+        else if(rt_strcmp(argv[1], "mutex") == 0)
         {
             list_mutex();
         }
 #endif /* RT_USING_MUTEX */
 #ifdef RT_USING_MAILBOX
-        else if(strcmp(argv[1], "mailbox") == 0)
+        else if(rt_strcmp(argv[1], "mailbox") == 0)
         {
             list_mailbox();
         }
 #endif  /* RT_USING_MAILBOX */
 #ifdef RT_USING_MESSAGEQUEUE
-        else if(strcmp(argv[1], "msgqueue") == 0)
+        else if(rt_strcmp(argv[1], "msgqueue") == 0)
         {
             list_msgqueue();
         }
 #endif /* RT_USING_MESSAGEQUEUE */
 #ifdef RT_USING_MEMHEAP
-        else if(strcmp(argv[1], "memheap") == 0)
+        else if(rt_strcmp(argv[1], "memheap") == 0)
         {
             list_memheap();
         }
 #endif /* RT_USING_MEMHEAP */
 #ifdef RT_USING_MEMPOOL
-        else if(strcmp(argv[1], "mempool") == 0)
+        else if(rt_strcmp(argv[1], "mempool") == 0)
         {
             list_mempool();
         }
 #endif /* RT_USING_MEMPOOL */
 #ifdef RT_USING_DEVICE
-        else if(strcmp(argv[1], "device") == 0)
+        else if(rt_strcmp(argv[1], "device") == 0)
         {
             list_device();
         }
 #endif /* RT_USING_DEVICE */
 #ifdef RT_USING_DFS
-        else if(strcmp(argv[1], "fd") == 0)
+        else if(rt_strcmp(argv[1], "fd") == 0)
         {
             extern int list_fd(void);
             list_fd();
diff --git a/components/finsh/msh.c b/components/finsh/msh.c
index 505f97f4ad8..7cf93855aff 100644
--- a/components/finsh/msh.c
+++ b/components/finsh/msh.c
@@ -63,7 +63,7 @@ static int cmd_ps(int argc, char **argv)
     extern int list_module(void);
 
 #ifdef RT_USING_MODULE
-    if ((argc == 2) && (strcmp(argv[1], "-m") == 0))
+    if ((argc == 2) && (rt_strcmp(argv[1], "-m") == 0))
         list_module();
     else
 #endif
@@ -237,7 +237,7 @@ static cmd_function_t msh_get_cmd(char *cmd, int size)
             index < _syscall_table_end;
             FINSH_NEXT_SYSCALL(index))
     {
-        if (strncmp(index->name, cmd, size) == 0 &&
+        if (rt_strncmp(index->name, cmd, size) == 0 &&
                 index->name[size] == '\0')
         {
             cmd_func = (cmd_function_t)index->func;
@@ -276,7 +276,7 @@ int msh_exec_module(const char *cmd_line, int size)
     rt_memcpy(pg_name, cmd_line, cmd_length);
     pg_name[cmd_length] = '\0';
 
-    if (strstr(pg_name, ".mo") != RT_NULL || strstr(pg_name, ".MO") != RT_NULL)
+    if (rt_strstr(pg_name, ".mo") != RT_NULL || rt_strstr(pg_name, ".MO") != RT_NULL)
     {
         /* try to open program */
         fd = open(pg_name, O_RDONLY, 0);
@@ -374,12 +374,12 @@ static rt_bool_t _msh_lwp_cmd_exists(const char *path)
 static char *_msh_exec_search_path(const char *path, const char *pg_name)
 {
     char *path_buffer = RT_NULL;
-    ssize_t pg_len = strlen(pg_name);
+    ssize_t pg_len = rt_strlen(pg_name);
     ssize_t base_len = 0;
 
     if (path)
     {
-        base_len = strlen(path);
+        base_len = rt_strlen(path);
     }
 
     path_buffer = rt_malloc(base_len + pg_len + 6);
@@ -390,7 +390,7 @@ static char *_msh_exec_search_path(const char *path, const char *pg_name)
 
     if (base_len > 0)
     {
-        memcpy(path_buffer, path, base_len);
+        rt_memcpy(path_buffer, path, base_len);
         path_buffer[base_len] = '/';
         path_buffer[base_len + 1] = '\0';
     }
@@ -405,7 +405,7 @@ static char *_msh_exec_search_path(const char *path, const char *pg_name)
         return path_buffer;
     }
 
-    if (strstr(path_buffer, ".elf") != NULL)
+    if (rt_strstr(path_buffer, ".elf") != NULL)
     {
         goto not_found;
     }
@@ -506,7 +506,7 @@ int _msh_exec_lwp(int debug, char *cmd, rt_size_t length)
 
     /* only check these paths when the first argument doesn't contain path
        seperator */
-    if (strstr(argv[0], "/"))
+    if (rt_strstr(argv[0], "/"))
     {
         return -1;
     }
@@ -704,14 +704,14 @@ void msh_auto_complete_path(char *path)
             if (dirent == RT_NULL) break;
 
             /* matched the prefix string */
-            if (strncmp(index, dirent->d_name, rt_strlen(index)) == 0)
+            if (rt_strncmp(index, dirent->d_name, rt_strlen(index)) == 0)
             {
                 multi ++;
                 if (min_length == 0)
                 {
                     min_length = rt_strlen(dirent->d_name);
                     /* save dirent name */
-                    strcpy(full_path, dirent->d_name);
+                    rt_strcpy(full_path, dirent->d_name);
                 }
 
                 length = str_common(dirent->d_name, full_path);
@@ -735,7 +735,7 @@ void msh_auto_complete_path(char *path)
                     dirent = readdir(dir);
                     if (dirent == RT_NULL) break;
 
-                    if (strncmp(index, dirent->d_name, rt_strlen(index)) == 0)
+                    if (rt_strncmp(index, dirent->d_name, rt_strlen(index)) == 0)
                         rt_kprintf("%s\n", dirent->d_name);
                 }
             }
@@ -822,14 +822,14 @@ void msh_auto_complete(char *prefix)
         {
             /* skip finsh shell function */
             cmd_name = (const char *) index->name;
-            if (strncmp(prefix, cmd_name, strlen(prefix)) == 0)
+            if (rt_strncmp(prefix, cmd_name, rt_strlen(prefix)) == 0)
             {
                 if (min_length == 0)
                 {
                     /* set name_ptr */
                     name_ptr = cmd_name;
                     /* set initial length */
-                    min_length = strlen(name_ptr);
+                    min_length = rt_strlen(name_ptr);
                 }
 
                 length = str_common(name_ptr, cmd_name);
@@ -865,14 +865,14 @@ static msh_cmd_opt_t *msh_get_cmd_opt(char *opt_str)
     }
     else
     {
-        len = strlen(opt_str);
+        len = rt_strlen(opt_str);
     }
 #if defined(FINSH_USING_SYMTAB)
     for (index = _syscall_table_begin;
             index < _syscall_table_end;
             FINSH_NEXT_SYSCALL(index))
     {
-        if (strncmp(index->name, opt_str, len) == 0 && index->name[len] == '\0')
+        if (rt_strncmp(index->name, opt_str, len) == 0 && index->name[len] == '\0')
         {
             opt = index->opt;
             break;
@@ -906,18 +906,18 @@ static void msh_opt_complete(char *opts_str, struct msh_cmd_opt *cmd_opt)
     const char *name_ptr = RT_NULL;
     int min_length = 0, length, opts_str_len;
 
-    opts_str_len = strlen(opts_str);
+    opts_str_len = rt_strlen(opts_str);
 
     for (opt = cmd_opt; opt->id; opt++)
     {
-        if (!strncmp(opt->name, opts_str, opts_str_len))
+        if (!rt_strncmp(opt->name, opts_str, opts_str_len))
         {
             if (min_length == 0)
             {
                 /* set name_ptr */
                 name_ptr = opt->name;
                 /* set initial length */
-                min_length = strlen(name_ptr);
+                min_length = rt_strlen(name_ptr);
             }
 
             length = str_common(name_ptr, opt->name);
@@ -933,7 +933,7 @@ static void msh_opt_complete(char *opts_str, struct msh_cmd_opt *cmd_opt)
 
     if (name_ptr != NULL)
     {
-        strncpy(opts_str, name_ptr, min_length);
+        rt_strncpy(opts_str, name_ptr, min_length);
     }
 }
 
@@ -959,7 +959,7 @@ void msh_opt_auto_complete(char *prefix)
     {
         opt = msh_get_cmd_opt(prefix);
     }
-    else if (!msh_get_cmd(prefix, strlen(prefix)) && (' ' == prefix[strlen(prefix) - 1]))
+    else if (!msh_get_cmd(prefix, rt_strlen(prefix)) && (' ' == prefix[rt_strlen(prefix) - 1]))
     {
         opt = msh_get_cmd_opt(prefix);
     }
@@ -989,7 +989,7 @@ int msh_cmd_opt_id_get(int argc, char *argv[], void *options)
 
     for (opt_id = 0; (argc >= 2) && opt && opt->id; opt++)
     {
-        if (!strcmp(opt->name, argv[1]))
+        if (!rt_strcmp(opt->name, argv[1]))
         {
             opt_id = opt->id;
             break;
diff --git a/components/finsh/msh_file.c b/components/finsh/msh_file.c
index 07e22a82066..feebdd6377d 100644
--- a/components/finsh/msh_file.c
+++ b/components/finsh/msh_file.c
@@ -90,7 +90,7 @@ int msh_exec_script(const char *cmd_line, int size)
     rt_memcpy(pg_name, cmd_line, cmd_length);
     pg_name[cmd_length] = '\0';
 
-    if (strstr(pg_name, ".sh") != RT_NULL || strstr(pg_name, ".SH") != RT_NULL)
+    if (rt_strstr(pg_name, ".sh") != RT_NULL || rt_strstr(pg_name, ".SH") != RT_NULL)
     {
         /* try to open program */
         fd = open(pg_name, O_RDONLY, 0);
@@ -351,7 +351,7 @@ static void directory_delete_for_msh(const char *pathname, char f, char v)
         if (rt_strcmp(".", dirent->d_name) != 0 &&
                 rt_strcmp("..", dirent->d_name) != 0)
         {
-            if (strlen(pathname) + 1 + strlen(dirent->d_name) > DFS_PATH_MAX)
+            if (rt_strlen(pathname) + 1 + rt_strlen(dirent->d_name) > DFS_PATH_MAX)
             {
                 rt_kprintf("cannot remove '%s/%s', path too long.\n", pathname, dirent->d_name);
                 continue;
@@ -518,7 +518,7 @@ static int cmd_mkfs(int argc, char **argv)
     }
     else if (argc == 4)
     {
-        if (strcmp(argv[1], "-t") == 0)
+        if (rt_strcmp(argv[1], "-t") == 0)
         {
             type = argv[2];
             result = dfs_mkfs(type, argv[3]);
@@ -585,7 +585,7 @@ static int cmd_mount(int argc, char **argv)
 
         /* mount a filesystem to the specified directory */
         rt_kprintf("mount device %s(%s) onto %s ... ", device, fstype, path);
-        if (strcmp(fstype, "nfs") == 0)
+        if (rt_strcmp(fstype, "nfs") == 0)
         {
             data = argv[1];
             device = 0;
@@ -663,7 +663,7 @@ static int cmd_umount(int argc, char **argv)
 
     if (argc > 2)
     {
-        flags = strcmp(argv[1], "-f") == 0 ? MNT_FORCE : 0;
+        flags = rt_strcmp(argv[1], "-f") == 0 ? MNT_FORCE : 0;
         path  = argv[2];
     }
 
@@ -693,7 +693,7 @@ static int cmd_df(int argc, char **argv)
     }
     else
     {
-        if ((strcmp(argv[1], "--help") == 0) || (strcmp(argv[1], "-h") == 0))
+        if ((rt_strcmp(argv[1], "--help") == 0) || (rt_strcmp(argv[1], "-h") == 0))
         {
             rt_kprintf("df [path]\n");
         }
@@ -721,7 +721,7 @@ static int cmd_echo(int argc, char **argv)
         fd = open(argv[2], O_RDWR | O_APPEND | O_CREAT, 0);
         if (fd >= 0)
         {
-            write(fd, argv[1], strlen(argv[1]));
+            write(fd, argv[1], rt_strlen(argv[1]));
             close(fd);
         }
         else
@@ -875,7 +875,7 @@ static void directory_setattr(const char *pathname, struct dfs_attr *attr, char
         if (rt_strcmp(".", dirent->d_name) != 0 &&
             rt_strcmp("..", dirent->d_name) != 0)
         {
-            if (strlen(pathname) + 1 + strlen(dirent->d_name) > DFS_PATH_MAX)
+            if (rt_strlen(pathname) + 1 + rt_strlen(dirent->d_name) > DFS_PATH_MAX)
             {
                 rt_kprintf("'%s/%s' setattr failed, path too long.\n", pathname, dirent->d_name);
                 continue;
diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index 05a1018194e..c85696ba8ac 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -79,10 +79,10 @@ int finsh_set_prompt(const char *prompt)
     /* strdup */
     if (prompt)
     {
-        finsh_prompt_custom = (char *)rt_malloc(strlen(prompt) + 1);
+        finsh_prompt_custom = (char *)rt_malloc(rt_strlen(prompt) + 1);
         if (finsh_prompt_custom)
         {
-            strcpy(finsh_prompt_custom, prompt);
+            rt_strcpy(finsh_prompt_custom, prompt);
         }
     }
 
@@ -105,11 +105,11 @@ const char *finsh_get_prompt(void)
 
     if (finsh_prompt_custom)
     {
-        strncpy(finsh_prompt, finsh_prompt_custom, sizeof(finsh_prompt) - 1);
+        rt_strncpy(finsh_prompt, finsh_prompt_custom, sizeof(finsh_prompt) - 1);
     }
     else
     {
-        strcpy(finsh_prompt, _MSH_PROMPT);
+        rt_strcpy(finsh_prompt, _MSH_PROMPT);
     }
 
 #if defined(DFS_USING_POSIX) && defined(DFS_USING_WORKDIR)
@@ -423,7 +423,7 @@ static void shell_push_history(struct finsh_shell *shell)
         if (shell->history_count >= FINSH_HISTORY_LINES)
         {
             /* if current cmd is same as last cmd, don't push */
-            if (memcmp(&shell->cmd_history[FINSH_HISTORY_LINES - 1], shell->line, FINSH_CMD_SIZE))
+            if (rt_memcmp(&shell->cmd_history[FINSH_HISTORY_LINES - 1], shell->line, FINSH_CMD_SIZE))
             {
                 /* move history */
                 int index;
@@ -442,7 +442,7 @@ static void shell_push_history(struct finsh_shell *shell)
         else
         {
             /* if current cmd is same as last cmd, don't push */
-            if (shell->history_count == 0 || memcmp(&shell->cmd_history[shell->history_count - 1], shell->line, FINSH_CMD_SIZE))
+            if (shell->history_count == 0 || rt_memcmp(&shell->cmd_history[shell->history_count - 1], shell->line, FINSH_CMD_SIZE))
             {
                 shell->current_history = shell->history_count;
                 rt_memset(&shell->cmd_history[shell->history_count][0], 0, FINSH_CMD_SIZE);
@@ -597,7 +597,7 @@ static void finsh_thread_entry(void *parameter)
                 /* copy the history command */
                 rt_memcpy(shell->line, &shell->cmd_history[shell->current_history][0],
                        FINSH_CMD_SIZE);
-                shell->line_curpos = shell->line_position = (rt_uint16_t)strlen(shell->line);
+                shell->line_curpos = shell->line_position = (rt_uint16_t)rt_strlen(shell->line);
                 shell_handle_history(shell);
 #endif
                 continue;
@@ -619,7 +619,7 @@ static void finsh_thread_entry(void *parameter)
 
                 rt_memcpy(shell->line, &shell->cmd_history[shell->current_history][0],
                        FINSH_CMD_SIZE);
-                shell->line_curpos = shell->line_position = (rt_uint16_t)strlen(shell->line);
+                shell->line_curpos = shell->line_position = (rt_uint16_t)rt_strlen(shell->line);
                 shell_handle_history(shell);
 #endif
                 continue;
@@ -758,7 +758,7 @@ static void finsh_thread_entry(void *parameter)
             /* auto complete */
             shell_auto_complete(&shell->line[0]);
             /* re-calculate position */
-            shell->line_curpos = shell->line_position = (rt_uint16_t)strlen(shell->line);
+            shell->line_curpos = shell->line_position = (rt_uint16_t)rt_strlen(shell->line);
 
             continue;
         }