diff --git a/src/locales/en.ts b/src/locales/en.ts
index 62412256..27de02b9 100644
--- a/src/locales/en.ts
+++ b/src/locales/en.ts
@@ -4654,6 +4654,7 @@ export default {
       warningCompleteDeviceDate: 'Please complete device, start date and end date',
       warningValidTime: 'Please select a valid time',
       warningEndBeforeStart: 'End time cannot be earlier than start time',
+      warningDragOutOfRange: 'Drag out of date range, reverted to original position',
       columnTaskName: 'Task Name',
       columnDeviceName: 'Device Name',
       columnPlanInfo: 'Plan Info',
diff --git a/src/locales/zh-CN.ts b/src/locales/zh-CN.ts
index c8c0f053..3f79dd51 100644
--- a/src/locales/zh-CN.ts
+++ b/src/locales/zh-CN.ts
@@ -4865,6 +4865,7 @@ export default {
       warningCompleteDeviceDate: '请完善设备、计划开始日期和计划结束日期',
       warningValidTime: '请选择有效的时间',
       warningEndBeforeStart: '结束时间不能早于开始时间',
+      warningDragOutOfRange: '拖拽超出日期范围，已恢复原位',
       columnTaskName: '任务名称',
       columnDeviceName: '设备名称',
       columnPlanInfo: '计划信息',
diff --git a/src/views/mes/tasksummary/components/ScheduleGanttPanelEditable.vue b/src/views/mes/tasksummary/components/ScheduleGanttPanelEditable.vue
index 8a9bf268..639b13ab 100644
--- a/src/views/mes/tasksummary/components/ScheduleGanttPanelEditable.vue
+++ b/src/views/mes/tasksummary/components/ScheduleGanttPanelEditable.vue
@@ -462,11 +462,18 @@ const attachPlanBarDrag = (bar: HTMLElement, plan: any, task: any) => {
     if (!moved) return
     moved = false
 
-    saveUndoSnapshot()
-
     const dx = e.clientX - startX
     const newLeft = Math.max(0, startLeft + dx)
     const newStartDate = gantt.dateFromPos(newLeft)
+
+    if (!newStartDate || !dayjs(newStartDate).isValid()) {
+      message.warning(t('GanttChart.GanttPanel.warningDragOutOfRange'))
+      initGanttPreview()
+      return
+    }
+
+    saveUndoSnapshot()
+
     const planDuration = dayjs(plan.planEndTimeStr).diff(dayjs(plan.planStartTimeStr), 'millisecond')
     const newEndDate = new Date(newStartDate.getTime() + planDuration)
 
@@ -568,13 +575,19 @@ const attachPlanBarResize = (bar: HTMLElement, plan: any, task: any) => {
       resizing = false
       bar.style.zIndex = '2'
 
-      saveUndoSnapshot()
-
       const newLeft = parseFloat(bar.style.left) || startLeft
       const newWidth = parseFloat(bar.style.width) || startWidth
       const newStartDate = gantt.dateFromPos(newLeft)
       const newEndDate = gantt.dateFromPos(newLeft + newWidth)
 
+      if (!newStartDate || !newEndDate || !dayjs(newStartDate).isValid() || !dayjs(newEndDate).isValid()) {
+        message.warning(t('GanttChart.GanttPanel.warningDragOutOfRange'))
+        initGanttPreview()
+        return
+      }
+
+      saveUndoSnapshot()
+
       const identity = makePlanIdentity(plan)
       const original = findOriginalPlan(identity)
       if (original) {