diff --git a/zh-cn/device-dev/kernel/kernel-basic-mini-time.md b/zh-cn/device-dev/kernel/kernel-basic-mini-time.md
index dbc2309930171c1fbfb5dac3096931857e6ea520..36c468a90bca1d1a37daaaf698647b7454f5d29c 100644
--- a/zh-cn/device-dev/kernel/kernel-basic-mini-time.md
+++ b/zh-cn/device-dev/kernel/kernel-basic-mini-time.md
@@ -12,7 +12,7 @@
 OpenHarmony LiteOS-M内核时间管理模块提供时间转换、统计功能。
 
 
-## 时间单位：
+## 时间单位
 
 - Cycle
   系统最小的计时单位。Cycle的时长由系统主时钟频率决定，系统主时钟频率就是每秒钟的Cycle数。