diff --git a/rt-thread-version/rt-thread-standard/programming-manual/device/dac/dac.md b/rt-thread-version/rt-thread-standard/programming-manual/device/dac/dac.md
index a5fc22d085f716d0c7d79bfc935246551599913c..effca8240eef0fe5fa3155644cfa12275606a450 100644
--- a/rt-thread-version/rt-thread-standard/programming-manual/device/dac/dac.md
+++ b/rt-thread-version/rt-thread-standard/programming-manual/device/dac/dac.md
@@ -100,9 +100,8 @@ rt_dac_enable(dac_dev, DAC_DEV_CHANNEL);
 rt_err_t rt_dac_write(rt_dac_device_t dev, rt_uint32_t channel, rt_uint32_t value);
 ```
 
-|            |              |
-| ---------- | ------------ |
 | **参数**   | **描述**     |
+| ---------- | ------------ |
 | dev        | DAC 设备句柄 |
 | channel    | DAC 通道     |
 | value      | DAC 输出值   |