diff --git a/app/admin/_components/TemplateManager.tsx b/app/admin/_components/TemplateManager.tsx
index fd3edd1..caf7a41 100644
--- a/app/admin/_components/TemplateManager.tsx
+++ b/app/admin/_components/TemplateManager.tsx
@@ -39,6 +39,47 @@ const STATUS_OPTIONS = [
 
 const MATERIAL_TYPE_OPTIONS = ['3DMAX', 'PSD', '音频', '视频', '模特', '其他']
 
+type MigrationPreviewField = {
+  key: string
+  label: string
+  type?: string
+  source: 'template' | 'standard'
+  affectedCount?: number
+}
+
+type MigrationPreviewResponse = {
+  success: boolean
+  previewOnly: true
+  migratableCount: number
+  message: string
+  sourceTemplate: { id: string; name: string }
+  targetTemplate: { id: string; name: string }
+  migrationBackup: {
+    materialsWithDroppedFields: number
+    droppedTemplateFieldCount: number
+    droppedStandardFieldCount: number
+  }
+  migrationPreview: {
+    totalMaterials: number
+    targetCurrentFields: Array<{
+      key: string
+      label: string
+      type: string
+      required: boolean
+    }>
+    backupFields: {
+      templateFields: MigrationPreviewField[]
+      standardFields: MigrationPreviewField[]
+    }
+    samples: Array<{
+      materialId: string
+      productModel: string | null
+      droppedTemplateFields: MigrationPreviewField[]
+      droppedStandardFields: MigrationPreviewField[]
+    }>
+  }
+}
+
 // 默认需要进入分类管理的字段集合，可被后台实时配置覆盖
 const DEFAULT_CATEGORY_FIELDS = [
   'categoryName',
@@ -484,6 +525,9 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
   const [migrationSourceTemplate, setMigrationSourceTemplate] = useState<{ id: string; name: string; materialCount: number } | null>(null)
   const [migrationTargetTemplateId, setMigrationTargetTemplateId] = useState<string>('')
   const [migrating, setMigrating] = useState(false)
+  const [migrationPreview, setMigrationPreview] = useState<MigrationPreviewResponse | null>(null)
+  const [migrationPreviewLoading, setMigrationPreviewLoading] = useState(false)
+  const [migrationPreviewError, setMigrationPreviewError] = useState<string | null>(null)
 
   const syncCategoryFieldSet = useCallback((keys: string[]) => {
     GLOBAL_CATEGORY_FIELDS.clear()
@@ -1649,6 +1693,8 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
           materialCount: templateDetail.materialCount,
         })
         setMigrationTargetTemplateId('')
+        setMigrationPreview(null)
+        setMigrationPreviewError(null)
         setMigrationDialogOpen(true)
         return
       }
@@ -1673,10 +1719,46 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
       setDeletingId(null)
     }
   }
+
+  const handleMigrationTargetChange = (targetTemplateId: string) => {
+    setMigrationTargetTemplateId(targetTemplateId)
+    setMigrationPreview(null)
+    setMigrationPreviewError(null)
+  }
+
+  const loadMigrationPreview = async () => {
+    if (!migrationSourceTemplate || !migrationTargetTemplateId || migrationPreviewLoading) return
+
+    setMigrationPreviewLoading(true)
+    setMigrationPreviewError(null)
+    try {
+      const preview = await requestJson<MigrationPreviewResponse>(
+        `/api/admin/upload-templates/${migrationSourceTemplate.id}/migrate`,
+        {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({
+            targetTemplateId: migrationTargetTemplateId,
+            previewOnly: true,
+          }),
+        }
+      )
+      setMigrationPreview(preview)
+    } catch (error: any) {
+      setMigrationPreview(null)
+      setMigrationPreviewError(error.message || '生成迁移预览失败')
+    } finally {
+      setMigrationPreviewLoading(false)
+    }
+  }
   
   // 执行素材迁移并删除模板
   const handleMigrateAndDelete = async () => {
     if (!migrationSourceTemplate || !migrationTargetTemplateId) return
+    if (!migrationPreview || migrationPreview.targetTemplate.id !== migrationTargetTemplateId) {
+      setMigrationPreviewError('请先生成迁移预览，确认字段影响后再执行迁移。')
+      return
+    }
     
     setMigrating(true)
     try {
@@ -1701,6 +1783,8 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
       setMigrationDialogOpen(false)
       setMigrationSourceTemplate(null)
       setMigrationTargetTemplateId('')
+      setMigrationPreview(null)
+      setMigrationPreviewError(null)
       
       // 通知首页刷新模板列表
       notifyTemplatesUpdate()
@@ -1713,10 +1797,12 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
   
   // 关闭迁移弹窗
   const closeMigrationDialog = () => {
-    if (migrating) return
+    if (migrating || migrationPreviewLoading) return
     setMigrationDialogOpen(false)
     setMigrationSourceTemplate(null)
     setMigrationTargetTemplateId('')
+    setMigrationPreview(null)
+    setMigrationPreviewError(null)
   }
   
   // 获取可选的目标模板列表（排除源模板）
@@ -1933,12 +2019,12 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
         <Modal
           isOpen={migrationDialogOpen}
           onClose={closeMigrationDialog}
-          size="medium"
+          size="large"
           showCloseButton={true}
-          closeOnOverlayClick={!migrating}
-          closeOnEscape={!migrating}
+          closeOnOverlayClick={!migrating && !migrationPreviewLoading}
+          closeOnEscape={!migrating && !migrationPreviewLoading}
         >
-          <div className="bg-white dark:bg-slate-900 rounded-xl shadow-lg p-6 max-w-lg w-full">
+          <div className="bg-white dark:bg-slate-900 rounded-lg shadow-lg p-6 max-h-[84vh] overflow-y-auto">
             <div className="flex items-center gap-3 mb-4">
               <div className="w-10 h-10 rounded-full bg-amber-100 dark:bg-amber-900/30 flex items-center justify-center">
                 <svg className="w-5 h-5 text-amber-600 dark:text-amber-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
@@ -1972,8 +2058,8 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
               </label>
               <select
                 value={migrationTargetTemplateId}
-                onChange={(e) => setMigrationTargetTemplateId(e.target.value)}
-                disabled={migrating}
+                onChange={(e) => handleMigrationTargetChange(e.target.value)}
+                disabled={migrating || migrationPreviewLoading}
                 className={cn(
                   'w-full px-3 py-2 rounded-lg border transition-colors',
                   'bg-white dark:bg-slate-800',
@@ -2013,11 +2099,123 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
                 </p>
               )}
             </div>
+
+            <div className="mb-6">
+              <div className="flex items-center justify-between gap-3">
+                <div>
+                  <p className="text-sm font-medium text-slate-700 dark:text-slate-300">
+                    迁移预览
+                  </p>
+                  <p className="text-xs text-slate-500 dark:text-slate-400 mt-1">
+                    预览不会修改数据，确认字段影响后再执行迁移。
+                  </p>
+                </div>
+                <button
+                  type="button"
+                  onClick={loadMigrationPreview}
+                  disabled={migrating || migrationPreviewLoading || !migrationTargetTemplateId}
+                  className={cn(
+                    'px-3 py-2 rounded-lg text-sm font-medium transition-colors',
+                    'border border-slate-300 dark:border-slate-600',
+                    'bg-white dark:bg-slate-800 text-slate-700 dark:text-slate-200',
+                    'hover:bg-slate-50 dark:hover:bg-slate-700',
+                    'disabled:opacity-50 disabled:cursor-not-allowed'
+                  )}
+                >
+                  {migrationPreviewLoading ? '生成中...' : migrationPreview ? '刷新预览' : '生成预览'}
+                </button>
+              </div>
+
+              {migrationPreviewError && (
+                <p className="mt-3 text-sm text-red-600 dark:text-red-400">
+                  {migrationPreviewError}
+                </p>
+              )}
+
+              {migrationPreview && (
+                <div className="mt-3 rounded-lg border border-slate-200 dark:border-slate-700 p-4 space-y-4">
+                  <div className="grid grid-cols-3 gap-3 text-sm">
+                    <div>
+                      <p className="text-xs text-slate-500 dark:text-slate-400">可迁移素材</p>
+                      <p className="mt-1 font-semibold text-slate-900 dark:text-white">
+                        {migrationPreview.migratableCount}
+                      </p>
+                    </div>
+                    <div>
+                      <p className="text-xs text-slate-500 dark:text-slate-400">需备份素材</p>
+                      <p className="mt-1 font-semibold text-slate-900 dark:text-white">
+                        {migrationPreview.migrationBackup.materialsWithDroppedFields}
+                      </p>
+                    </div>
+                    <div>
+                      <p className="text-xs text-slate-500 dark:text-slate-400">备份字段</p>
+                      <p className="mt-1 font-semibold text-slate-900 dark:text-white">
+                        {migrationPreview.migrationBackup.droppedTemplateFieldCount + migrationPreview.migrationBackup.droppedStandardFieldCount}
+                      </p>
+                    </div>
+                  </div>
+
+                  <div>
+                    <p className="text-xs font-medium text-slate-500 dark:text-slate-400 mb-2">
+                      迁移后当前字段
+                    </p>
+                    <div className="flex flex-wrap gap-2">
+                      {migrationPreview.migrationPreview.targetCurrentFields.slice(0, 12).map((field) => (
+                        <span
+                          key={field.key}
+                          className="rounded-md bg-slate-100 px-2 py-1 text-xs text-slate-700 dark:bg-slate-800 dark:text-slate-300"
+                        >
+                          {field.label}{field.required ? ' *' : ''}
+                        </span>
+                      ))}
+                      {migrationPreview.migrationPreview.targetCurrentFields.length > 12 && (
+                        <span className="rounded-md bg-slate-100 px-2 py-1 text-xs text-slate-500 dark:bg-slate-800 dark:text-slate-400">
+                          另有 {migrationPreview.migrationPreview.targetCurrentFields.length - 12} 个
+                        </span>
+                      )}
+                    </div>
+                  </div>
+
+                  {(migrationPreview.migrationPreview.backupFields.templateFields.length > 0 ||
+                    migrationPreview.migrationPreview.backupFields.standardFields.length > 0) ? (
+                    <div>
+                      <p className="text-xs font-medium text-slate-500 dark:text-slate-400 mb-2">
+                        会进入备份区的旧字段
+                      </p>
+                      <div className="flex flex-wrap gap-2">
+                        {[
+                          ...migrationPreview.migrationPreview.backupFields.templateFields,
+                          ...migrationPreview.migrationPreview.backupFields.standardFields,
+                        ].slice(0, 12).map((field) => (
+                          <span
+                            key={`${field.source}-${field.key}`}
+                            className="rounded-md bg-amber-50 px-2 py-1 text-xs text-amber-800 dark:bg-amber-900/20 dark:text-amber-200"
+                          >
+                            {field.label}（{field.affectedCount || 0}）
+                          </span>
+                        ))}
+                      </div>
+                      {migrationPreview.migrationPreview.samples.length > 0 && (
+                        <p className="mt-2 text-xs text-slate-500 dark:text-slate-400">
+                          示例素材：{migrationPreview.migrationPreview.samples
+                            .map((sample) => sample.productModel || sample.materialId)
+                            .join('、')}
+                        </p>
+                      )}
+                    </div>
+                  ) : (
+                    <p className="text-sm text-slate-500 dark:text-slate-400">
+                      目标模板已接收当前字段，本次迁移不会产生旧字段备份。
+                    </p>
+                  )}
+                </div>
+              )}
+            </div>
             
             <div className="flex gap-3 justify-end">
               <button
                 onClick={closeMigrationDialog}
-                disabled={migrating}
+                disabled={migrating || migrationPreviewLoading}
                 className={cn(
                   'px-4 py-2 rounded-lg text-sm font-medium transition-colors',
                   'bg-slate-100 dark:bg-slate-800 text-slate-700 dark:text-slate-300',
@@ -2029,7 +2227,7 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
               </button>
               <button
                 onClick={handleMigrateAndDelete}
-                disabled={migrating || !migrationTargetTemplateId}
+                disabled={migrating || migrationPreviewLoading || !migrationTargetTemplateId || !migrationPreview || migrationPreview.targetTemplate.id !== migrationTargetTemplateId}
                 className={cn(
                   'px-4 py-2 rounded-lg text-sm font-medium transition-colors',
                   'bg-red-600 text-white',
@@ -2047,7 +2245,7 @@ export default function TemplateManager({ showToast }: { showToast: ToastFn }) {
                     迁移中...
                   </>
                 ) : (
-                  <>迁移并删除</>
+                  <>确认迁移并删除</>
                 )}
               </button>
             </div>
diff --git a/docs/商业化地基排查问题清单_20260524.md b/docs/商业化地基排查问题清单_20260524.md
index cd1663d..b49c9ad 100644
--- a/docs/商业化地基排查问题清单_20260524.md
+++ b/docs/商业化地基排查问题清单_20260524.md
@@ -676,7 +676,7 @@ NAS 断电、容器重启、升级重启后，正在处理的视频可能永久
 
 - 已完成：默认保留旧字段到备份命名空间，避免历史字段无声丢失。
 - 已完成：迁移前可通过 `previewOnly: true` 获取预览报告，列出哪些字段会进入备份区，哪些字段会成为目标模板当前字段。
-- 仍需继续：前端模板管理页还需要把迁移预览接入正式确认流程，避免管理员直接盲点迁移按钮。
+- 已完成：前端模板管理页的迁移删除弹窗已接入预览确认流程；管理员必须先生成当前目标模板的迁移预览，确认字段影响后才能点击“确认迁移并删除”。
 
 ### P1-14 上传会截断 metadata，可能截坏 JSON（已修复上传、编辑和模板迁移入口）