diff --git a/internal/services/cron_service.go b/internal/services/cron_service.go
index bf41bdb..f63a453 100644
--- a/internal/services/cron_service.go
+++ b/internal/services/cron_service.go
@@ -22,10 +22,8 @@ type CronService struct {
 
 // NewCronService creates a new cron service
 func NewCronService(taskService *TaskService, executorService *ExecutorService) *CronService {
-	// 使用秒级精度的 cron parser，支持 5 位和 6 位表达式
-	c := cron.New(cron.WithParser(cron.NewParser(
-		cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor,
-	)))
+	// 使用秒级精度的 cron parser，支持 6 位表达式（秒 分 时 日 月 周）
+	c := cron.New(cron.WithSeconds())
 
 	return &CronService{
 		cron:            c,
@@ -135,9 +133,9 @@ func (cs *CronService) updateNextRun(taskID uint) {
 	}
 }
 
-// ValidateCron validates a cron expression
+// ValidateCron validates a cron expression (6 fields: second minute hour day month weekday)
 func (cs *CronService) ValidateCron(expression string) error {
-	parser := cron.NewParser(cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor)
+	parser := cron.NewParser(cron.Second | cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor)
 	_, err := parser.Parse(expression)
 	return err
 }
diff --git a/web/src/views/tasks/Tasks.vue b/web/src/views/tasks/Tasks.vue
index daf5b82..2fb9f47 100644
--- a/web/src/views/tasks/Tasks.vue
+++ b/web/src/views/tasks/Tasks.vue
@@ -26,13 +26,15 @@ const total = ref(0)
 let searchTimer: ReturnType<typeof setTimeout> | null = null
 
 const cronPresets = [
-  { label: '每分钟', value: '* * * * *' },
-  { label: '每5分钟', value: '*/5 * * * *' },
-  { label: '每小时', value: '0 * * * *' },
-  { label: '每天0点', value: '0 0 * * *' },
-  { label: '每天8点', value: '0 8 * * *' },
-  { label: '每周一', value: '0 0 * * 1' },
-  { label: '每月1号', value: '0 0 1 * *' },
+  { label: '每5秒', value: '*/5 * * * * *' },
+  { label: '每30秒', value: '*/30 * * * * *' },
+  { label: '每分钟', value: '0 * * * * *' },
+  { label: '每5分钟', value: '0 */5 * * * *' },
+  { label: '每小时', value: '0 0 * * * *' },
+  { label: '每天0点', value: '0 0 0 * * *' },
+  { label: '每天8点', value: '0 0 8 * * *' },
+  { label: '每周一', value: '0 0 0 * * 1' },
+  { label: '每月1号', value: '0 0 0 1 * *' },
 ]
 
 async function loadTasks() {
@@ -57,7 +59,7 @@ function handlePageChange(page: number) {
 }
 
 function openCreate() {
-  editingTask.value = { name: '', command: '', schedule: '0 * * * *', timeout: 30, enabled: true }
+  editingTask.value = { name: '', command: '', schedule: '0 * * * * *', timeout: 30, enabled: true }
   isEdit.value = false
   showDialog.value = true
 }
@@ -195,11 +197,13 @@ onMounted(loadTasks)
           </div>
           <div class="grid grid-cols-4 items-center gap-4">
             <Label class="text-right">定时规则</Label>
-            <Input v-model="editingTask.schedule" placeholder="0 * * * *" class="col-span-3 font-mono" />
+            <Input v-model="editingTask.schedule" placeholder="0 * * * * *" class="col-span-3 font-mono" />
           </div>
           <div class="grid grid-cols-4 items-start gap-4">
             <span></span>
-            <div class="col-span-3 flex flex-wrap gap-1.5">
+            <div class="col-span-3">
+              <p class="text-xs text-muted-foreground mb-2">格式: 秒 分 时 日 月 周</p>
+              <div class="flex flex-wrap gap-1.5">
               <span
                 v-for="preset in cronPresets"
                 :key="preset.value"
@@ -208,6 +212,7 @@ onMounted(loadTasks)
               >
                 {{ preset.label }}
               </span>
+              </div>
             </div>
           </div>
           <div class="grid grid-cols-4 items-center gap-4">