diff --git a/examples/bluetooth/ble_hid_device_demo/main/ble_hidd_demo_main.c b/examples/bluetooth/ble_hid_device_demo/main/ble_hidd_demo_main.c
index ae7e0cac9..e26fa38d9 100644
--- a/examples/bluetooth/ble_hid_device_demo/main/ble_hidd_demo_main.c
+++ b/examples/bluetooth/ble_hid_device_demo/main/ble_hidd_demo_main.c
@@ -29,19 +29,10 @@
 
 /**
  * Brief:
- * This test code shows how to configure gpio and how to use gpio interrupt.
- *
- * GPIO status:
- * GPIO18: output
- * GPIO19: output
- * GPIO4:  input, pulled up, interrupt from rising edge and falling edge
- * GPIO5:  input, pulled up, interrupt from rising edge.
- *
- * Test:
- * Connect GPIO18 with GPIO4
- * Connect GPIO19 with GPIO5
- * Generate pulses on GPIO18/19, that triggers interrupt on GPIO4/5
- *
+ * This example Implemented BLE HID device profile related functions, in which the HID device
+ * has 4 Reports (1 is mouse, 2 is keyboard and LED, 3 is Consumer Devices, 4 is Vendor devices).
+ * Users can choose different reports according to their own application scenarios.
+ * BLE HID profile inheritance and USB HID class.
  */
 
 /** 
@@ -58,15 +49,6 @@
 #define HID_DEMO_TAG "HID_DEMO"
 
 
-#define GPIO_OUTPUT_IO_0    18
-#define GPIO_OUTPUT_IO_1    19
-#define GPIO_OUTPUT_PIN_SEL  ((1<<GPIO_OUTPUT_IO_0) | (1<<GPIO_OUTPUT_IO_1))
-#define GPIO_INPUT_IO_0     21
-#define GPIO_INPUT_IO_1     27
-#define GPIO_INPUT_PIN_SEL  ((1<<GPIO_INPUT_IO_0) | (1<<GPIO_INPUT_IO_1))
-#define ESP_INTR_FLAG_DEFAULT 0
-
-static xQueueHandle gpio_evt_queue = NULL;
 static uint16_t hid_conn_id = 0;
 static bool sec_conn = false;
 static bool send_volum_up = false;
@@ -108,75 +90,6 @@ static esp_ble_adv_params_t hidd_adv_params = {
     .adv_filter_policy = ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY,
 };
 
-void IRAM_ATTR gpio_isr_handler(void* arg)
-{
-    uint32_t gpio_num = (uint32_t) arg;
-    xQueueSendFromISR(gpio_evt_queue, &gpio_num, NULL);
-}
-
-void gpio_task_example(void* arg)
-{
-    static uint8_t i = 0;
-    uint32_t io_num;
-    for(;;) {
-        if(xQueueReceive(gpio_evt_queue, &io_num, portMAX_DELAY)) {
-            ESP_LOGI(HID_DEMO_TAG, "GPIO[%d] intr, val: %d\n", io_num, gpio_get_level(io_num));
-            if(i == 0) {
-            ++i;
-            }
-        }
-    }
-}
-
-static void gpio_demo_init(void)
-{
-    gpio_config_t io_conf;
-    //disable interrupt
-    io_conf.intr_type = GPIO_PIN_INTR_DISABLE;
-    //set as output mode        
-    io_conf.mode = GPIO_MODE_OUTPUT;
-    //bit mask of the pins that you want to set,e.g.GPIO18/19
-    io_conf.pin_bit_mask = GPIO_OUTPUT_PIN_SEL;
-    //disable pull-down mode
-    io_conf.pull_down_en = 0;
-    //disable pull-up mode
-    io_conf.pull_up_en = 0;
-    //configure GPIO with the given settings
-    gpio_config(&io_conf);
-
-    //interrupt of rising edge
-    io_conf.intr_type = GPIO_PIN_INTR_POSEDGE;
-    //bit mask of the pins, use GPIO4/5 here
-    io_conf.pin_bit_mask = GPIO_INPUT_PIN_SEL;
-    //set as input mode    
-    io_conf.mode = GPIO_MODE_INPUT;
-    //enable pull-up mode
-    io_conf.pull_up_en = 1;
-    gpio_config(&io_conf);
-
-    //change gpio intrrupt type for one pin
-    gpio_set_intr_type(GPIO_INPUT_IO_0, GPIO_INTR_ANYEDGE);
-
-    //create a queue to handle gpio event from isr
-    gpio_evt_queue = xQueueCreate(10, sizeof(uint32_t));
-    //start gpio task
-    xTaskCreate(gpio_task_example, "gpio_task_example", 2048, NULL, 10, NULL);
-
-    //install gpio isr service
-    gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
-    //hook isr handler for specific gpio pin
-    gpio_isr_handler_add(GPIO_INPUT_IO_0, gpio_isr_handler, (void*) GPIO_INPUT_IO_0);
-    //hook isr handler for specific gpio pin
-    gpio_isr_handler_add(GPIO_INPUT_IO_1, gpio_isr_handler, (void*) GPIO_INPUT_IO_1);
-
-    //remove isr handler for gpio number.
-    gpio_isr_handler_remove(GPIO_INPUT_IO_0);
-    //hook isr handler for specific gpio pin again
-    gpio_isr_handler_add(GPIO_INPUT_IO_0, gpio_isr_handler, (void*) GPIO_INPUT_IO_0);
-
-}
-
-
 
 static void hidd_event_callback(esp_hidd_cb_event_t event, esp_hidd_cb_param_t *param)
 {
@@ -333,9 +246,6 @@ void app_main()
     esp_ble_gap_set_security_param(ESP_BLE_SM_SET_INIT_KEY, &init_key, sizeof(uint8_t));
     esp_ble_gap_set_security_param(ESP_BLE_SM_SET_RSP_KEY, &rsp_key, sizeof(uint8_t));
 
-    //init the gpio pin
-    gpio_demo_init();
     xTaskCreate(&hid_demo_task, "hid_task", 2048, NULL, 5, NULL);
-
 }