diff --git a/zh-cn/device-dev/kernel/kernel-small-debug-process-cpu.md b/zh-cn/device-dev/kernel/kernel-small-debug-process-cpu.md
index 89a46e053ec053321e9f667ba59d74c1f8013b56..70080158ad7bfa3a210d965ad44c502a35f55acf 100644
--- a/zh-cn/device-dev/kernel/kernel-small-debug-process-cpu.md
+++ b/zh-cn/device-dev/kernel/kernel-small-debug-process-cpu.md
@@ -135,7 +135,7 @@ UINT32 ItCpupTest(VOID)
 
     usleep(100);
 
-    /* 获取当前系统历史cpu占用率 */
+    /* 获取当前系统历史CPU占用率 */
     cpupUse = LOS_HistorySysCpuUsage(CPU_LESS_THAN_1S); 
     printf("the history system cpu usage in all time：%u.%u\n",
            cpupUse / LOS_CPUP_PRECISION_MULT, cpupUse % LOS_CPUP_PRECISION_MULT);