diff --git a/applications/main.c b/applications/main.c
index a7baf77..3a3e867 100644
--- a/applications/main.c
+++ b/applications/main.c
@@ -293,7 +293,7 @@ int main(void)
     // 定义超时时间，单位为毫秒
 #define TIMEOUT_MS     (3 * 60 * 1000)
 #define WORK_TIMER_CNT (1000 * 60 * 60)//按照小时算
-
+    rt_thread_mdelay(200);
     if (Get_VIN_VoltageInt1000x() > 10000)
     {
         SYS_EventInit();
diff --git a/bsp/inc/bsp_vin_detection.h b/bsp/inc/bsp_vin_detection.h
index ef3bb59..863eec7 100644
--- a/bsp/inc/bsp_vin_detection.h
+++ b/bsp/inc/bsp_vin_detection.h
@@ -25,7 +25,7 @@
 // (4.7/19.7) * 13V = 3.1V, 3.1/3.3*4096 = 3723
 #define VIN_ADC_HIGH_THRESHOLD      (uint16_t)3847  // 13V
 // (4.7/19.7) * 10V = 2.39V, 2.39/3.3*4096 = 2966
-#define VIN_ADC_LOW_THRESHOLD       (uint16_t)2665  // 9V
+#define VIN_ADC_LOW_THRESHOLD       (uint16_t)2369  // 8V
 
 
 float Get_VIN_Voltage(void);
diff --git a/bsp/src/at_device_ml307.c b/bsp/src/at_device_ml307.c
index 93f1116..c0eddbe 100644
--- a/bsp/src/at_device_ml307.c
+++ b/bsp/src/at_device_ml307.c
@@ -959,11 +959,6 @@ static void ml307_init_thread_entry (void *parameter)
             result = -RT_ERROR;
             goto __exit;
         }
-        if (at_obj_exec_cmd (device->client, resp, "AT+CEREG=1") != RT_EOK)
-        {
-            result = -RT_ERROR;
-            goto __exit;
-        }
         /* Define PDP Context */
         for (i = 0; i < COMMON_RETRY; i++)
         {
diff --git a/bsp/src/bsp_ml307.c b/bsp/src/bsp_ml307.c
index 0f589e4..70df6b5 100644
--- a/bsp/src/bsp_ml307.c
+++ b/bsp/src/bsp_ml307.c
@@ -1977,7 +1977,7 @@ static void Ml307_Life_Thread_Entry (void *parameter)
                 }
                 if (device->class->device_ops->control (device, AT_DEVICE_CTRL_POWER_OFF, RT_NULL) == RT_EOK)
                 {
-                    rt_thread_mdelay (RT_TICK_PER_SECOND);
+                    rt_thread_mdelay ((RT_TICK_PER_SECOND*2));
                     if (device->class->device_ops->control (device, AT_DEVICE_CTRL_POWER_ON, RT_NULL) == RT_EOK)
                     {
                         LOG_D ("AT device power on success");
@@ -2020,7 +2020,7 @@ static void Ml307_Life_Thread_Entry (void *parameter)
                             result = -RT_ERROR;
                             goto __exit;
                         }
-                        /* check SIM card */
+                                                /* check SIM card */
                         for (i = 0; i < 60; i++)
                         {
                             if (at_obj_exec_cmd (device->client, resp, "AT+CPIN?") == RT_EOK)
@@ -2049,47 +2049,7 @@ static void Ml307_Life_Thread_Entry (void *parameter)
                             result = -RT_ERROR;
                             goto __exit;
                         }
-                         /* Define PDP Context */
-                        for (i = 0; i < 60; i++)
-                        {
-                            if (at_obj_exec_cmd (device->client, resp, "AT+CGACT=1") == RT_EOK)
-                            {
-                                LOG_D ("pdp激活成功");
-                                break;
-                            }
-                            else
-                            {
-                                // AT+CGACT=0,1 //去激活 PDP
-                                if (at_obj_exec_cmd (device->client, resp, "AT+CGACT=0") == RT_EOK)
-                                {
-                                    LOG_D ("pdp去激活成功");
-                                }
-                            }
-                            rt_thread_mdelay (5000);
-                        }
-                        if (i == 60)
-                        {
-                            result = -RT_ERROR;
-                            goto __exit;
-                        }
-
-
-                        for (i = 0; i < 5; i++)
-                        {
-                            if (at_obj_exec_cmd (device->client, resp, "AT+CGDCONT=1,\"IPV4V6\",\"cmnet\"") == RT_EOK)
-                            {
-                                LOG_D ("%s device Define PDP Context Success.", device->name);
-                                break;
-                            }
-                            rt_thread_mdelay (1000);
-                        }
-                        if (i == 5)
-                        {
-                            LOG_E ("%s device Define PDP Context failed.", device->name);
-                            result = -RT_ERROR;
-                            goto __exit;
-                        }
-                        if (at_obj_exec_cmd (device->client, resp, "AT+CEREG=1") != RT_EOK)
+                           if (at_obj_exec_cmd (device->client, resp, "AT+CEREG=1") != RT_EOK)
                         {
                             result = -RT_ERROR;
                             goto __exit;
@@ -2118,6 +2078,47 @@ static void Ml307_Life_Thread_Entry (void *parameter)
                             result = -RT_ERROR;
                             goto __exit;
                         }
+                         for (i = 0; i < 5; i++)
+                        {
+                            if (at_obj_exec_cmd (device->client, resp, "AT+CGDCONT=1,\"IPV4V6\",\"cmnet\"") == RT_EOK)
+                            {
+                                LOG_D ("%s device Define PDP Context Success.", device->name);
+                                break;
+                            }
+                            rt_thread_mdelay (1000);
+                        }
+                        if (i == 5)
+                        {
+                            LOG_E ("%s device Define PDP Context failed.", device->name);
+                            result = -RT_ERROR;
+                            goto __exit;
+                        }
+
+                        //  /* Define PDP Context */
+                        // for (i = 0; i < 60; i++)
+                        // {
+                        //     if (at_obj_exec_cmd (device->client, resp, "AT+CGACT=1") == RT_EOK)
+                        //     {
+                        //         LOG_D ("pdp激活成功");
+                        //         break;
+                        //     }
+                        //     else
+                        //     {
+                        //         // AT+CGACT=0,1 //去激活 PDP
+                        //         if (at_obj_exec_cmd (device->client, resp, "AT+CGACT=0") == RT_EOK)
+                        //         {
+                        //             LOG_D ("pdp去激活成功");
+                        //         }
+                        //     }
+                        //     rt_thread_mdelay (1000);
+                        // }
+                        // if (i == 60)
+                        // {
+                        //     result = -RT_ERROR;
+                        //     goto __exit;
+                        // }
+
+
                         if (at_obj_exec_cmd (device->client, resp, "AT+MIPCALL=1,1") != RT_EOK)
                         {
                             result = -RT_ERROR;