diff --git a/demo/os/rt-thread/stm32f10x/app/src/user_finsh_cmd.c b/demo/os/rt-thread/stm32f10x/app/src/user_finsh_cmd.c
index 02b7a7b..41813b5 100644
--- a/demo/os/rt-thread/stm32f10x/app/src/user_finsh_cmd.c
+++ b/demo/os/rt-thread/stm32f10x/app/src/user_finsh_cmd.c
@@ -10,6 +10,7 @@
 #include <finsh.h>
 #include "cpuusage.h"
 #include "elog_flash.h"
+#include "easyflash.h"
 
 static void reboot(uint8_t argc, char **argv) {
     NVIC_SystemReset();
@@ -24,6 +25,47 @@ static void get_cpuusage(void) {
 }
 MSH_CMD_EXPORT(get_cpuusage, Get control board cpu usage);
 
+void setenv(uint8_t argc, char **argv) {
+    uint8_t i;
+    char c_value = NULL;
+    char *value = &c_value;
+    if (argc > 3) {
+        /* environment variable value string together */
+        for (i = 0; i < argc - 2; i++) {
+            argv[2 + i][rt_strlen(argv[2 + i])] = ' ';
+        }
+    }
+    if (argc == 1) {
+        ef_set_env(value, value);
+    } else if (argc == 2) {
+        ef_set_env(argv[1], value);
+    } else {
+        ef_set_env(argv[1], argv[2]);
+    }
+}
+MSH_CMD_EXPORT(setenv, Set an envrionment variable.);
+
+void printenv(uint8_t argc, char **argv) {
+    ef_print_env();
+}
+MSH_CMD_EXPORT(printenv, Print all envrionment variables.);
+
+void saveenv(uint8_t argc, char **argv) {
+    ef_save_env();
+}
+MSH_CMD_EXPORT(saveenv, Save all envrionment variables to flash.);
+
+void getvalue(uint8_t argc, char **argv) {
+    char *value = NULL;
+    value = ef_get_env(argv[1]);
+    if (value) {
+        rt_kprintf("The %s value is %s.\n", argv[1], value);
+    } else {
+        rt_kprintf("Can't find %s.\n", argv[1]);
+    }
+}
+MSH_CMD_EXPORT(getvalue, Get an envrionment variable by name.);
+
 static void elog(uint8_t argc, char **argv) {
     if (argc > 1) {
         if (!strcmp(argv[1], "on") || !strcmp(argv[1], "ON")) {
diff --git a/docs/zh/port/flash.md b/docs/zh/port/flash.md
index 60403dd..7823917 100644
--- a/docs/zh/port/flash.md
+++ b/docs/zh/port/flash.md
@@ -92,7 +92,7 @@ void elog_flash_port_unlock(void)
 每次使用前，务必核心功能都已经初始化完成，再调用`elog_flash_init()`方法对Flash插件进行初始化，保证初始化没问题后，再调用`elog_start()`方法启动EasyLogger，最后就可以使用Flash插件自带的API方法进行测试。如果使用的RT-Thread的Demo，则可以按照[这里的命令要求](https://github.com/armink/EasyLogger/tree/master/demo/os/rt-thread/stm32f10x#22-flash-log将日志保存到flash中)，接上finsh串口，输入finsh命令即可测试。
 
 摘取自STM32平台下RT-Thread Demo中的初始化过程（[点击查看全部](https://github.com/armink/EasyLogger/blob/master/demo/os/rt-thread/stm32f10x/app/src/app_task.c)）：
-```
+```c
 /* 初始化EasyFlash及EasyLogger */
 if ((easyflash_init() == EF_NO_ERR)&&(elog_init() == ELOG_NO_ERR)) {
     /* 设置日志格式 */