diff --git a/app/include/common.h b/app/include/common.h
index 03e430f..a7196a5 100755
--- a/app/include/common.h
+++ b/app/include/common.h
@@ -124,6 +124,7 @@ typedef enum _BOOT_MSG
     BOOT_PPP_FOUND_CSG_LINK_FAIL,
     BOOT_PPP_FOUND_MQTT_LINK_FAIL,
     BOOT_TTYUSB_NO_FOUND,
+    BOOT_RUN_OVER_24_HOURS,
     BOOT_MAX,
 } BOOT_MSG;
 
diff --git a/app/include/process.h b/app/include/process.h
index 3e80713..41d2e07 100755
--- a/app/include/process.h
+++ b/app/include/process.h
@@ -51,7 +51,6 @@ typedef enum
 /* Extern global variables ---------------------------------------------------*/
 extern int32_t recv_qid;
 extern uint16_t version_hex;
-extern uint32_t start_time;
 
 /* Exported macro ------------------------------------------------------------*/
 
diff --git a/app/lib/a_process/process.c b/app/lib/a_process/process.c
index 7a6de68..b52e7b0 100755
--- a/app/lib/a_process/process.c
+++ b/app/lib/a_process/process.c
@@ -72,7 +72,6 @@
 /* Private variables ---------------------------------------------------------*/
 int32_t recv_qid;
 uint16_t version_hex;
-uint32_t start_time;
 sys_ctrl_t sysctrl = {0};
 
 /* Private function prototypes -----------------------------------------------*/
@@ -187,7 +186,6 @@ int32_t main(int32_t argc, char **argv)
         /* 点 RUN 灯. */
         GPIO_RUN_LED(cnt & 0x1);
         
-        start_time++;
         cnt++;
 
         sleep(1);
@@ -198,6 +196,12 @@ int32_t main(int32_t argc, char **argv)
             usleep(100*1000);
             GPIO_WDT_CTRL(0);
         }
+
+        time_t curTime = time(NULL);
+        if (CPUMS_DIFF(sysctrl.start_time, curTime) >= 86400)
+        {
+            reboot_system(LOG_DEFAULT, BOOT_RUN_OVER_24_HOURS);
+        }
     }
     
     return 0;
diff --git a/app/lib/m_management/common.c b/app/lib/m_management/common.c
index a43fccb..e9cd1ef 100755
--- a/app/lib/m_management/common.c
+++ b/app/lib/m_management/common.c
@@ -609,6 +609,7 @@ boot_msg_t g_bootmsg[] =
     {BOOT_PPP_FOUND_CSG_LINK_FAIL, "ppp0 found but csg link failed."},
     {BOOT_PPP_FOUND_MQTT_LINK_FAIL, "ppp0 found but mqtt link failed."},
     {BOOT_TTYUSB_NO_FOUND, "/dev/ttyUSB3 not found."},
+    {BOOT_RUN_OVER_24_HOURS, "The device has been running for more than 24 hours and needs to be restarted."},
     {BOOT_MAX, NULL}
 };
 
diff --git a/build/Makefile b/build/Makefile
index 0d7e3a2..ae41bfe 100755
--- a/build/Makefile
+++ b/build/Makefile
@@ -31,7 +31,7 @@ VERSION_FILE := $(SOURCE_DIR)/include/version.h
 MQTTLIB_DIR := $(SOURCE_DIR)/lib/l_library
 VERSION_LIB := version.a
 DATE_STRING := `date "+%Y.%m.%d %k:%M:%S"`
-VERSION_STRING := "6.2.1.15"
+VERSION_STRING := "6.2.1.16"
 
 MV := mv -f
 RM := rm -rf