diff --git a/components/drivers/include/drivers/adc.h b/components/drivers/include/drivers/adc.h
index 2e4da26819..b332c94538 100644
--- a/components/drivers/include/drivers/adc.h
+++ b/components/drivers/include/drivers/adc.h
@@ -12,17 +12,18 @@
 
 #ifndef __ADC_H__
 #define __ADC_H__
+
 #include <rtthread.h>
 
-#define RT_ADC_INTERN_CH_TEMPER ((rt_uint32_t)-1)
-#define RT_ADC_INTERN_CH_VREF   ((rt_uint32_t)-2)
-#define RT_ADC_INTERN_CH_VBAT   ((rt_uint32_t)-3)
+#define RT_ADC_INTERN_CH_TEMPER     (-1)
+#define RT_ADC_INTERN_CH_VREF       (-2)
+#define RT_ADC_INTERN_CH_VBAT       (-3)
 
 struct rt_adc_device;
 struct rt_adc_ops
 {
-    rt_err_t (*enabled)(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled);
-    rt_err_t (*convert)(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value);
+    rt_err_t (*enabled)(struct rt_adc_device *device, rt_int8_t channel, rt_bool_t enabled);
+    rt_err_t (*convert)(struct rt_adc_device *device, rt_int8_t channel, rt_uint32_t *value);
     rt_uint8_t (*get_resolution)(struct rt_adc_device *device);
     rt_int16_t (*get_vref) (struct rt_adc_device *device);
 };
@@ -43,10 +44,9 @@ typedef enum
 } rt_adc_cmd_t;
 
 rt_err_t rt_hw_adc_register(rt_adc_device_t adc,const char *name, const struct rt_adc_ops *ops, const void *user_data);
-
-rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_uint32_t channel);
-rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_uint32_t channel);
-rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_uint32_t channel);
-rt_int16_t rt_adc_voltage(rt_adc_device_t dev, rt_uint32_t channel);
+rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_int8_t channel);
+rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_int8_t channel);
+rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_int8_t channel);
+rt_int16_t rt_adc_voltage(rt_adc_device_t dev, rt_int8_t channel);
 
 #endif /* __ADC_H__ */
diff --git a/components/drivers/misc/adc.c b/components/drivers/misc/adc.c
index 29dbb86f96..0f96198cef 100644
--- a/components/drivers/misc/adc.c
+++ b/components/drivers/misc/adc.c
@@ -115,7 +115,7 @@ rt_err_t rt_hw_adc_register(rt_adc_device_t device, const char *name, const stru
     return result;
 }
 
-rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_uint32_t channel)
+rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_int8_t channel)
 {
     rt_uint32_t value;
 
@@ -126,7 +126,7 @@ rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_uint32_t channel)
     return value;
 }
 
-rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_uint32_t channel)
+rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_int8_t channel)
 {
     rt_err_t result = RT_EOK;
 
@@ -144,7 +144,7 @@ rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_uint32_t channel)
     return result;
 }
 
-rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_uint32_t channel)
+rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_int8_t channel)
 {
     rt_err_t result = RT_EOK;
 
@@ -162,7 +162,7 @@ rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_uint32_t channel)
     return result;
 }
 
-rt_int16_t rt_adc_voltage(rt_adc_device_t dev, rt_uint32_t channel)
+rt_int16_t rt_adc_voltage(rt_adc_device_t dev, rt_int8_t channel)
 {
     rt_uint32_t value = 0;
     rt_int16_t vref = 0, voltage = 0;