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 6a076a58f1da2840773ea7f7e78862f5e68f791d..a0bc3b8ddfd75839d5d97a011c93b6ff80eb84fc 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
@@ -243,7 +243,7 @@ static int dac_vol_sample(int argc, char *argv[])
 
     /* 设置输出值 */
     value = atoi(argv[1]);
-    rt_dac_write(dac_dev, DAC_DEV_NAME, DAC_DEV_CHANNEL, &value);
+    rt_dac_write(dac_dev, DAC_DEV_NAME, DAC_DEV_CHANNEL, value);
     rt_kprintf("the value is :%d \n", value);
 
     /* 转换为对应电压值 */