diff --git a/APP_Framework/Applications/sensor_app/Makefile b/APP_Framework/Applications/sensor_app/Makefile
index 15d1c9691..03bc3952a 100644
--- a/APP_Framework/Applications/sensor_app/Makefile
+++ b/APP_Framework/Applications/sensor_app/Makefile
@@ -22,10 +22,11 @@ ifeq ($(CONFIG_ADD_NUTTX_FETURES),y)
     ifeq ($(CONFIG_APPLICATION_SENSOR_CO2_ZG09), y)
         CSRCS += co2_zg09.c
     endif
-
+    
     ifeq ($(CONFIG_APPLICATION_SENSOR_CO2_G8S), y)
         CSRCS += co2_g8s.c
     endif
+    
 
     ifeq ($(CONFIG_APPLICATION_SENSOR_PM1_0_PS5308), y)
         CSRCS += pm1_0_ps5308.c
diff --git a/APP_Framework/Framework/sensor/co2/Kconfig b/APP_Framework/Framework/sensor/co2/Kconfig
index 8efcaa1f1..78a965e8d 100644
--- a/APP_Framework/Framework/sensor/co2/Kconfig
+++ b/APP_Framework/Framework/sensor/co2/Kconfig
@@ -102,29 +102,12 @@ config SENSOR_G8S
                 if ADD_NUTTX_FETURES
                        config SENSOR_DEVICE_G8S_DEV
                                string "CO2 device name"
-                               default "/dev/ttyS1"
+                               default "/dev/ttyS3"
                                ---help---
                                    If USART1 is selected, then fill in /dev/ttyS1 here.
                 endif
 
                 if ADD_RTTHREAD_FETURES
-                        config SENSOR_G8S_DRIVER_EXTUART
-                                bool "Using extra uart to support g8-s"
-                                default y
 
-                        config SENSOR_DEVICE_G8S_DEV
-                                string "g8-s device uart path"
-                                default "/dev/uart2_dev2"
-                                depends on !SENSOR_G8S_DRIVER_EXTUART
-
-                        if SENSOR_G8S_DRIVER_EXTUART
-                                config SENSOR_DEVICE_G8S_DEV
-                                        string "g8-s device extra uart path"
-                                        default "/dev/extuart_dev4"
-
-                                config SENSOR_DEVICE_G8S_DEV_EXT_PORT
-                                        int "if G8S device using extuart, choose port"
-                                        default "4"
-                        endif
                 endif                
         endif
diff --git a/APP_Framework/Framework/sensor/co2/g8s/Make.defs b/APP_Framework/Framework/sensor/co2/g8s/Make.defs
new file mode 100644
index 000000000..f14b14928
--- /dev/null
+++ b/APP_Framework/Framework/sensor/co2/g8s/Make.defs
@@ -0,0 +1,6 @@
+############################################################################
+# APP_Framework/Framework/sensor/co2/g8s/Make.defs
+############################################################################
+ifneq ($(CONFIG_SENSOR_G8S),)
+CONFIGURED_APPS += $(APPDIR)/../../../APP_Framework/Framework/sensor/co2/g8s
+endif
diff --git a/APP_Framework/Framework/sensor/co2/g8s/g8s.c b/APP_Framework/Framework/sensor/co2/g8s/g8s.c
index a5122a131..89c7583bc 100644
--- a/APP_Framework/Framework/sensor/co2/g8s/g8s.c
+++ b/APP_Framework/Framework/sensor/co2/g8s/g8s.c
@@ -47,15 +47,8 @@ static int SensorDeviceOpen(struct SensorDevice *sdev)
         printf("open %s error\n", SENSOR_DEVICE_G8S_DEV);
         return -1;
     }
-    
-
-    result = sdev->done->ioctl(sdev, SENSOR_DEVICE_PASSIVE);
-    if (result != 0){
-        printf("SensorDeviceOpen:ioctl failed, status=%d\n", result);
-    }
-
-    return result;
 }
+
 #else
 static int SensorDeviceOpen(struct SensorDevice *sdev)
 {
@@ -97,10 +90,9 @@ static int SensorDeviceOpen(struct SensorDevice *sdev)
  */
 static int SensorDeviceRead(struct SensorDevice *sdev, size_t len)
 {
-    uint8_t tmp = 0;
 
     PrivWrite(sdev->fd, g8s_read_instruction, sizeof(g8s_read_instruction));
-
+    PrivTaskDelay(500);
     if (PrivRead(sdev->fd, sdev->buffer, len) < 0)
         return -1;
 
@@ -161,16 +153,26 @@ static int32_t QuantityRead(struct SensorQuantity *quant)
                 result_ascii[i] = quant->sdev->buffer[i];
             }
 
-            if (8 == ascii_length) {
-                for (i = 0; i < ascii_length; i ++) {
-                    result_hex[i] = result_ascii[i] - 0x30;
-                    result += result_hex[i] * pow(10, ascii_length - 1 - i);
-                }
-                return result;
-            } else {
+            if (ascii_length == 0){
+
                 printf("This reading is wrong\n");
+
                 result = SENSOR_QUANTITY_VALUE_ERROR;
+
                 return result;
+
+            }else{
+
+                for (i = 0; i < ascii_length; i ++) {
+
+                    result_hex[i] = result_ascii[i] - 0x30;
+
+                    result += result_hex[i] * pow(10, ascii_length - 1 - i);
+
+                }
+
+                return result;                
+
             }
         }
         if (quant->sdev->status == SENSOR_DEVICE_ACTIVE) {