diff --git a/packages/ui/certd-client/src/views/certd/pipeline/pipeline/component/trigger-form/index.vue b/packages/ui/certd-client/src/views/certd/pipeline/pipeline/component/trigger-form/index.vue
index 5d1c4800..02c5c84a 100644
--- a/packages/ui/certd-client/src/views/certd/pipeline/pipeline/component/trigger-form/index.vue
+++ b/packages/ui/certd-client/src/views/certd/pipeline/pipeline/component/trigger-form/index.vue
@@ -62,7 +62,7 @@
                 name: 'a-input',
                 vModel: 'value'
               },
-              helper: 'cron表达式，例如： * * 3 * * * ，表示每天凌晨3点触发',
+              helper: 'cron表达式，例如： 0 0 3 * * * ，表示每天凌晨3点触发',
               rules: [{ required: true, message: '此项必填' }]
             }"
           />
diff --git a/step.md b/step.md
index d3539697..9f3b6d71 100644
--- a/step.md
+++ b/step.md
@@ -88,8 +88,9 @@
 ![](./doc/images/13-3-download.png)
 
 ### 7. 定时触发
-配置定时触发，以后每天定时执行     
-到期前20天会自动申请新证书并部署，没到期前不会重复申请
+配置定时触发，以后每天定时执行    
+cron格式，例如： `0 0 3 * * *` 表示每天凌晨3点执行     
+到期前20天会自动申请新证书并部署，没到期前不会重复申请    
 ![](./doc/images/14-timer.png)
 
 ### 8. 邮件通知