diff --git a/applications/VK_Client.c b/applications/VK_Client.c
index 0d4e88e..bcf863b 100644
--- a/applications/VK_Client.c
+++ b/applications/VK_Client.c
@@ -14,6 +14,8 @@
 char cmd_cmd[100] = {0};
 char cmd_str[100] = {0};
 
+no_carrier_match_t _no_carrier_t = {0};
+
 /*关闭TCP连接*/
 void client_tcp_close(Cclient_t *client) {
   rt_sprintf(cmd_str, AT_QICLOSE, client->connect_ID);
@@ -22,6 +24,105 @@ void client_tcp_close(Cclient_t *client) {
   // client->error_cnt = 0;
 }
 
+static int no_carrier_char_parser(uint8_t ch){
+  int ret = 0;
+  switch(_no_carrier_t.match_stage){
+    case 0:
+      if(ch == 0x4E){
+        _no_carrier_t.match_stage++;
+      }else {
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 1:
+      if(ch == 0x4F){
+        _no_carrier_t.match_stage++;
+      }else{
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 2:
+      if(ch == 0x20){
+        _no_carrier_t.match_stage++;
+      }else{
+         _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 3:
+      if(ch == 0x43){
+        _no_carrier_t.match_stage++;
+      }else{
+         _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 4:
+      if(ch == 0x41){
+        _no_carrier_t.match_stage++;
+      }else{
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 5:
+      if(ch == 0x52){
+        _no_carrier_t.match_stage++;
+      }else{
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 6:
+      if(ch == 0x52){
+        _no_carrier_t.match_stage++;
+      }else{
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 7:
+      if(ch == 0x49){
+        _no_carrier_t.match_stage++;
+      }else{
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 8:
+      if(ch == 0x45){
+        _no_carrier_t.match_stage++;
+      }else{
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+    case 9:
+      if(ch == 0x52){
+        ret = 1;
+        _no_carrier_t.match_stage = 0;
+      }else{
+        _no_carrier_t.match_stage = 0;
+        ret = -1;
+      }
+    break;
+  }
+  return ret;
+}
+
+static void no_carrier_match(uint8_t * at_buf,rt_size_t len){
+  uint8_t buff[256] = {0};
+  rt_memcpy(buff, at_buf, len);
+  for(int i = 0;i < len;i++){
+    if(no_carrier_char_parser(buff[i]) == 1){
+      _no_carrier_t.match_flag = COMPLETE_MATCH;
+    }
+  }
+}
+
+
 /*将EC800K软件复位*/
 int16_t EC800K_Reset(void) {
   int16_t rst = -1;
@@ -212,7 +313,21 @@ int16_t client_yield(CLte_dev_t *pLte_dev) {
               rt_kprintf("disconnect!!!\n");
               hw_printf("disconnect!!!\n");
               pLte_dev->client1->connect_sta = false;
+              _no_carrier_t.match_flag = NO_MATCH;
               break;
+            } else if(strstr((const char *)lte_dev.at_buf, "\r\n")) {
+              _no_carrier_t.match_flag = HALF_MATCH;
+            }
+
+            if (_no_carrier_t.match_flag == HALF_MATCH) {
+              no_carrier_match(pLte_dev->at_buf, len);
+              if (_no_carrier_t.match_flag == COMPLETE_MATCH) {
+                rt_kprintf("disconnect!!!\n");
+                hw_printf("disconnect!!!\n");
+                pLte_dev->client1->connect_sta = false;
+                _no_carrier_t.match_flag = NO_MATCH;
+                break;
+              }
             }
 
             rt_device_t fmu_com = fmu_com_get();
diff --git a/applications/VK_Client.h b/applications/VK_Client.h
index 57117b3..33ad64a 100644
--- a/applications/VK_Client.h
+++ b/applications/VK_Client.h
@@ -8,6 +8,11 @@
 #include <stdint.h>
 #include "drv_ec800k.h"
 
+typedef struct {
+    uint8_t match_stage;
+    uint8_t match_flag;
+} no_carrier_match_t;
+
 
 void client_task(void);
 
diff --git a/applications/drv_ec800k.h b/applications/drv_ec800k.h
index e4eac20..b770277 100644
--- a/applications/drv_ec800k.h
+++ b/applications/drv_ec800k.h
@@ -253,6 +253,13 @@ enum {
   DTU_CF_NEED_RESET = 1,
 };
 
+
+enum {
+  NO_MATCH = 0,
+  HALF_MATCH = 1,
+  COMPLETE_MATCH = 2,
+};
+
 //////////////////////////////////////////////////////////////////////////////////////////
 bool isICCIDValid(char *str);