diff --git a/server/api/admin/articles.post.js b/server/api/admin/articles.post.js
index bd9d78c..7ba06f7 100644
--- a/server/api/admin/articles.post.js
+++ b/server/api/admin/articles.post.js
@@ -1,5 +1,6 @@
 import { useDB, schema } from '../../utils/db.js'
 import { requireAdmin } from '../../utils/auth.js'
+import { resolveTagsWithFallback } from '../../utils/article-helpers.js'
 
 export default defineEventHandler(async (event) => {
   requireAdmin(event)
@@ -21,7 +22,7 @@ export default defineEventHandler(async (event) => {
     type: body.type || 'news',
     coverImage: body.coverImage || null,
     author: body.author || '呼籁旅行',
-    tags: JSON.stringify(Array.isArray(body.tags) ? body.tags : []),
+    tags: JSON.stringify(resolveTagsWithFallback(body)),
     seoTitle: body.seoTitle || null,
     seoDesc: body.seoDesc || null,
     seoKeywords: body.seoKeywords || null,
diff --git a/server/api/admin/articles/[id].put.js b/server/api/admin/articles/[id].put.js
index 0966fae..bd385d8 100644
--- a/server/api/admin/articles/[id].put.js
+++ b/server/api/admin/articles/[id].put.js
@@ -1,6 +1,7 @@
 import { eq } from 'drizzle-orm'
 import { useDB, schema } from '../../../utils/db.js'
 import { requireAdmin } from '../../../utils/auth.js'
+import { resolveTagsWithFallback } from '../../../utils/article-helpers.js'
 
 export default defineEventHandler(async (event) => {
   requireAdmin(event)
@@ -18,10 +19,16 @@ export default defineEventHandler(async (event) => {
   if (body.category !== undefined) updateData.category = body.category
   if (body.coverImage !== undefined) updateData.coverImage = body.coverImage
   if (body.author !== undefined) updateData.author = body.author
-  if (body.tags !== undefined) updateData.tags = JSON.stringify(Array.isArray(body.tags) ? body.tags : [])
   if (body.seoTitle !== undefined) updateData.seoTitle = body.seoTitle
   if (body.seoDesc !== undefined) updateData.seoDesc = body.seoDesc
   if (body.seoKeywords !== undefined) updateData.seoKeywords = body.seoKeywords
+  // tags：前端传了用前端的；没传/空数组时从 seoKeywords fallback（admin 编辑页暂无 tags 输入）
+  if (body.tags !== undefined) {
+    updateData.tags = JSON.stringify(resolveTagsWithFallback(body))
+  } else if (body.seoKeywords !== undefined) {
+    // 用户改了 seoKeywords 但没传 tags，同步更新 tags
+    updateData.tags = JSON.stringify(resolveTagsWithFallback(body))
+  }
   if (body.published !== undefined) updateData.published = body.published ? 1 : 0
 
   db.update(schema.articles)
diff --git a/server/utils/article-helpers.js b/server/utils/article-helpers.js
new file mode 100644
index 0000000..a09b8be
--- /dev/null
+++ b/server/utils/article-helpers.js
@@ -0,0 +1,8 @@
+// 保存文章时若前端未提供 tags 或 tags 为空，自动从 SEO 关键词拆前 3 个作为展示标签
+// 兼容中/英逗号和顿号。tags 是卡片小标签（展示用），seo_keywords 是搜索引擎 meta 用，二者语义略有差异但在 admin 未提供 tags 输入框前用此兜底
+export function resolveTagsWithFallback(body) {
+  if (Array.isArray(body.tags) && body.tags.length) return body.tags
+  const kw = typeof body.seoKeywords === 'string' ? body.seoKeywords.trim() : ''
+  if (!kw) return []
+  return kw.split(/[,，、]/).map(s => s.trim()).filter(Boolean).slice(0, 3)
+}