diff --git a/rt-thread-version/rt-thread-nano/nano-ref/nano-device-adc/nano-device-adc.md b/rt-thread-version/rt-thread-nano/nano-ref/nano-device-adc/nano-device-adc.md
index 6cbbdd9f5cc5203e3f3e1d68d23063d51f115b4e..ec17ed1f279ce90c752dd45af5136816fc578fa3 100644
--- a/rt-thread-version/rt-thread-nano/nano-ref/nano-device-adc/nano-device-adc.md
+++ b/rt-thread-version/rt-thread-nano/nano-ref/nano-device-adc/nano-device-adc.md
@@ -80,7 +80,7 @@ rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_uint32_t channel);
 #endif /* __ADC_H__ */
 ```
 
-3. 我们需要适配如上 4 个 ADC 设备 API，参考实例：[drv_adc.c](./demo_code/drv_adc.c) 和 [drv_adc.h](./demo_code/drv_adc.h)。
+3. 我们需要适配如上 4 个 ADC 设备 API，参考实例：[drv_adc.c](https://gitee.com/rtthread/docs-online/tree/master/rt-thread-version/rt-thread-nano/nano-ref/nano-device-adc/demo_code/drv_adc.c) 和 [drv_adc.h](https://gitee.com/rtthread/docs-online/tree/master/rt-thread-version/rt-thread-nano/nano-ref/nano-device-adc/demo_code/drv_adc.h)。
 
 
 ## 编写 ADC 设备使用示例