diff --git a/zh-cn/device-dev/driver/driver-platform-pwm-des.md b/zh-cn/device-dev/driver/driver-platform-pwm-des.md
index b6679b4739f3c256f3c2a1d7f2097300813cac18..b010c1cf0f22d4f591d7c86d93d2d68d2a574d55 100644
--- a/zh-cn/device-dev/driver/driver-platform-pwm-des.md
+++ b/zh-cn/device-dev/driver/driver-platform-pwm-des.md
@@ -139,7 +139,6 @@ DevHandle PwmOpen(uint32_t num);
 
 | 参数       | 参数描述                |
 | ---------- | ----------------------- |
-| void       | NA                      |
 | num        | PWM设备编号             |
 | **返回值** | **返回值描述**          |
 | handle     | 获取成功返回PWM设备句柄 |