diff --git a/apps/admin/src/locales/langs/en.json b/apps/admin/src/locales/langs/en.json
index 66be2da..353e852 100644
--- a/apps/admin/src/locales/langs/en.json
+++ b/apps/admin/src/locales/langs/en.json
@@ -939,7 +939,7 @@
       "colEnabled": "Enabled",
       "colActions": "Actions",
       "scopeGlobal": "Global",
-      "scopeTargeted": "{n} albums",
+      "scopeTargeted": "{n} album | {n} albums",
       "imageAlt": "Ad image",
       "actionUp": "Move Up",
       "actionDown": "Move Down",
diff --git a/apps/admin/src/utils/ads/adsLogic.spec.ts b/apps/admin/src/utils/ads/adsLogic.spec.ts
index efa6c4a..c484017 100644
--- a/apps/admin/src/utils/ads/adsLogic.spec.ts
+++ b/apps/admin/src/utils/ads/adsLogic.spec.ts
@@ -1,7 +1,7 @@
 import { describe, expect, it } from 'vitest'
 import zhMessages from '@/locales/langs/zh.json'
 import enMessages from '@/locales/langs/en.json'
-import { isValidAdLinkUrl, normalizeAlbumIds, scopeKind } from './adsLogic'
+import { isValidAdLinkUrl, normalizeAlbumIds, planAdjacentMove, scopeKind } from './adsLogic'
 
 describe('scopeKind 投放范围分类', () => {
   it('null / 空数组 → global；非空 → targeted', () => {
@@ -44,6 +44,46 @@ describe('isValidAdLinkUrl 表单链接校验（与服务端 pattern 同源）',
   })
 })
 
+describe('planAdjacentMove 上移/下移目标值计算', () => {
+  it('异值互换：双方互换 sortOrder（上移/下移同式）', () => {
+    expect(planAdjacentMove(5, 8, -1)).toEqual({ rowNext: 8, neighborNext: 5 })
+    expect(planAdjacentMove(5, 8, 1)).toEqual({ rowNext: 8, neighborNext: 5 })
+    expect(planAdjacentMove(0, 3, -1)).toEqual({ rowNext: 3, neighborNext: 0 })
+  })
+
+  it('并列 2 行：下移抬本行 +1、上移抬邻居 +1（sortOrder ≥0 契约），另一侧保持', () => {
+    expect(planAdjacentMove(0, 0, 1)).toEqual({ rowNext: 1, neighborNext: 0 })
+    expect(planAdjacentMove(0, 0, -1)).toEqual({ rowNext: 0, neighborNext: 1 })
+    expect(planAdjacentMove(3, 3, 1)).toEqual({ rowNext: 4, neighborNext: 3 })
+    expect(planAdjacentMove(3, 3, -1)).toEqual({ rowNext: 3, neighborNext: 4 })
+  })
+
+  it('已知局限（文档化）：并列簇 ≥3 时单对错开不完备——B 上移后第三方 C 仍并列压过被抬的 A', () => {
+    // [A,B,C] 全 sortOrder=0（id 序=createdAt 序代理）；B 上移 → A=1、B=0、C=0
+    // → 排序结果 B,C,A（期望 B,A,C）：C 越过 A。新建恒为尾部追加（父页传
+    // max+1）后线上不会出现并列簇，此分支为历史数据兜底保险（dead insurance）。
+    const plan = planAdjacentMove(0, 0, -1) // row=B, neighbor=A
+    expect(plan).toEqual({ rowNext: 0, neighborNext: 1 })
+    const after = [
+      { id: 'A', sortOrder: plan.neighborNext },
+      { id: 'B', sortOrder: plan.rowNext },
+      { id: 'C', sortOrder: 0 }
+    ]
+    const sorted = [...after].sort((a, b) => a.sortOrder - b.sortOrder || a.id.localeCompare(b.id))
+    expect(sorted.map((row) => row.id)).toEqual(['B', 'C', 'A'])
+  })
+
+  it('边界 no-op 判定：异值互换双方均变更；并列恰一侧变更（调用方据此跳过 no-op PATCH）', () => {
+    const swap = planAdjacentMove(2, 7, 1)
+    expect(swap.rowNext).not.toBe(2)
+    expect(swap.neighborNext).not.toBe(7)
+    const bumpDown = planAdjacentMove(7, 7, 1)
+    expect([bumpDown.rowNext !== 7, bumpDown.neighborNext !== 7].filter(Boolean)).toHaveLength(1)
+    const bumpUp = planAdjacentMove(7, 7, -1)
+    expect([bumpUp.rowNext !== 7, bumpUp.neighborNext !== 7].filter(Boolean)).toHaveLength(1)
+  })
+})
+
 describe('adsManage 词条 zh/en 键集一致（对照 embedSlotsManage 先例）', () => {
   it('zh/en 键集合一致（adsManage 子树）', () => {
     const keysOf = (obj: Record<string, unknown>, prefix = ''): string[] =>
diff --git a/apps/admin/src/utils/ads/adsLogic.ts b/apps/admin/src/utils/ads/adsLogic.ts
index ac42dda..b706b51 100644
--- a/apps/admin/src/utils/ads/adsLogic.ts
+++ b/apps/admin/src/utils/ads/adsLogic.ts
@@ -5,6 +5,9 @@
  *   空数组提交落库归一 null（AdCreateRequestDto 注释口径）
  * - isValidAdLinkUrl 与服务端 pattern 同源（dto.ts LINK_URL_PATTERN：
  *   ^https?:// 前缀 + 契约 maxLength 2048）
+ * - planAdjacentMove 上移/下移目标值计算：新建恒为尾部追加（父页传
+ *   max+1，空列表=0），线上 sortOrder 全序无并列；并列分支为历史数据
+ *   兜底保险（≥3 并列簇的局限见 spec 文档化用例）
  */
 
 /** 投放范围：null 或空数组 → 'global'；非空 → 'targeted'。 */
@@ -23,3 +26,28 @@ export function normalizeAlbumIds(v: string[] | null): string[] | null {
 export function isValidAdLinkUrl(u: string): boolean {
   return /^https?:\/\//.test(u) && u.length <= 2048
 }
+
+/** 上移/下移的目标 sortOrder（值未变的一侧调用方跳过 no-op PATCH） */
+export interface AdjacentMovePlan {
+  rowNext: number
+  neighborNext: number
+}
+
+/**
+ * 邻位移动目标值：异值直接互换；并列（相等）时错开一档——下移抬本行
+ * +1、上移抬邻居 +1（契约 sortOrder ≥0，不可产出 -1），另一侧保持原值。
+ * 已知局限：并列簇 ≥3 时单对错开不完备（第三方仍并列压位，见 spec
+ * 文档化用例）；新建恒为尾部追加（max+1）后并列不会在线上出现。
+ */
+export function planAdjacentMove(
+  rowSortOrder: number,
+  neighborSortOrder: number,
+  dir: -1 | 1
+): AdjacentMovePlan {
+  if (rowSortOrder !== neighborSortOrder) {
+    return { rowNext: neighborSortOrder, neighborNext: rowSortOrder }
+  }
+  return dir === 1
+    ? { rowNext: neighborSortOrder + 1, neighborNext: neighborSortOrder }
+    : { rowNext: rowSortOrder, neighborNext: neighborSortOrder + 1 }
+}
diff --git a/apps/admin/src/views/system/ads/AdsFormDialog.vue b/apps/admin/src/views/system/ads/AdsFormDialog.vue
index 4981f02..1bbff33 100644
--- a/apps/admin/src/views/system/ads/AdsFormDialog.vue
+++ b/apps/admin/src/views/system/ads/AdsFormDialog.vue
@@ -111,7 +111,7 @@
 </template>
 
 <script setup lang="ts">
-  import { computed, ref, watch } from 'vue'
+  import { computed, onUnmounted, ref, watch } from 'vue'
   import { useI18n } from 'vue-i18n'
   import { ElMessage, type FormInstance, type FormRules } from 'element-plus'
   import { fetchAlbumList } from '@/api/albums'
@@ -129,6 +129,9 @@
   const props = defineProps<{
     /** 编辑目标（null = 新建） */
     ad: Api.Ads.Item | null
+    /** 新建追加的排序权重（父页 max+1；空列表=0）——尾部追加保证全序，
+        从源头杜绝并列簇 */
+    nextSortOrder: number
   }>()
 
   const emit = defineEmits<{
@@ -182,6 +185,9 @@
     }
   }
 
+  // 兜底：组件卸载时回收对象 URL（正常路径关闭对话框已回收）
+  onUnmounted(releasePreview)
+
   async function onFileChange(event: Event): Promise<void> {
     const input = event.target as HTMLInputElement
     const file = input.files?.[0]
@@ -268,10 +274,13 @@
     }
   }
 
-  /** 编辑态初始回显：已绑定 albumId 解析为标签（列表接口按 id 过滤；
-      超出拉取上限或已删除的相册以裸 ID 兜底——绑定不级联清理，容失效） */
-  async function hydrateBoundAlbums(ids: string[]): Promise<void> {
+  /** 打开即预载选项（新建态同样预载——避免未输入时误显「无匹配相册」，
+      对照 SlotBindDialog 打开即 searchAlbums('') 先例）；编辑态已绑定 ID
+      超出拉取上限或相册已删除的以裸 ID 兜底（绑定不级联清理，容失效） */
+  async function preloadOptions(): Promise<void> {
     await searchAlbums('')
+    if (props.ad === null) return
+    const ids = props.ad.albumIds ?? []
     const known = new Set(options.value.map((option) => option.id))
     const missing = ids.filter((id) => !known.has(id)).map((id) => ({ id, label: id }))
     if (missing.length) options.value = [...missing, ...options.value]
@@ -295,9 +304,7 @@
       form.value.albumIds = []
     }
     options.value = []
-    if (props.ad !== null && (props.ad.albumIds ?? []).length > 0) {
-      void hydrateBoundAlbums(props.ad.albumIds ?? [])
-    }
+    void preloadOptions()
   })
 
   async function submit(): Promise<void> {
@@ -334,6 +341,8 @@
               imageStagingKey: staging.value!.objectKey,
               imageBytes: staging.value!.bytes,
               imageContentType: staging.value!.contentType,
+              // 尾部追加（父页 max+1）：sortOrder 全序，杜绝并列簇
+              sortOrder: props.nextSortOrder,
               albumIds: albumIds ?? undefined
             })
       ElMessage.success(
diff --git a/apps/admin/src/views/system/ads/index.vue b/apps/admin/src/views/system/ads/index.vue
index fde3b02..2ea43bd 100644
--- a/apps/admin/src/views/system/ads/index.vue
+++ b/apps/admin/src/views/system/ads/index.vue
@@ -67,7 +67,7 @@
               {{ $t('adsManage.list.scopeGlobal') }}
             </ElTag>
             <ElTag v-else type="warning" effect="plain" data-test="ad-scope-targeted">
-              {{ $t('adsManage.list.scopeTargeted', { n: row.albumIds.length }) }}
+              {{ $t('adsManage.list.scopeTargeted', row.albumIds.length) }}
             </ElTag>
           </template>
         </ElTableColumn>
@@ -117,17 +117,22 @@
       </ElTable>
     </ElCard>
 
-    <AdsFormDialog v-model="formVisible" :ad="editing" @saved="onSaved" />
+    <AdsFormDialog
+      v-model="formVisible"
+      :ad="editing"
+      :next-sort-order="nextSortOrder"
+      @saved="onSaved"
+    />
   </div>
 </template>
 
 <script setup lang="ts">
-  import { onMounted, ref } from 'vue'
+  import { computed, onMounted, ref } from 'vue'
   import { useI18n } from 'vue-i18n'
   import { ElMessage, ElMessageBox } from 'element-plus'
   import AdsFormDialog from './AdsFormDialog.vue'
   import { fetchAds, fetchDeleteAd, fetchUpdateAd } from '@/api/ads'
-  import { scopeKind } from '@/utils/ads/adsLogic'
+  import { planAdjacentMove, scopeKind } from '@/utils/ads/adsLogic'
 
   defineOptions({ name: 'SystemAds' })
 
@@ -183,24 +188,14 @@
     if (moving.value || target < 0 || target >= items.value.length) return
     const row = items.value[index]
     const neighbor = items.value[target]
-    // 互换 sortOrder；并列相等时错开一档（上移改为抬邻居 +1——契约
-    // sortOrder ≥0，不可给移动行 -1），值未变的一侧跳过 no-op PATCH
-    const equal = row.sortOrder === neighbor.sortOrder
-    const rowNext = equal
-      ? dir === 1
-        ? neighbor.sortOrder + 1
-        : neighbor.sortOrder
-      : neighbor.sortOrder
-    const neighborNext = equal
-      ? dir === -1
-        ? neighbor.sortOrder + 1
-        : neighbor.sortOrder
-      : row.sortOrder
+    // 目标值计算收敛于纯函数 planAdjacentMove（异值互换/并列错开，含
+    // ≥3 并列簇局限文档化；值未变的一侧跳过 no-op PATCH）
+    const plan = planAdjacentMove(row.sortOrder, neighbor.sortOrder, dir)
     moving.value = true
     try {
-      if (rowNext !== row.sortOrder) await fetchUpdateAd(row.id, { sortOrder: rowNext })
-      if (neighborNext !== neighbor.sortOrder) {
-        await fetchUpdateAd(neighbor.id, { sortOrder: neighborNext })
+      if (plan.rowNext !== row.sortOrder) await fetchUpdateAd(row.id, { sortOrder: plan.rowNext })
+      if (plan.neighborNext !== neighbor.sortOrder) {
+        await fetchUpdateAd(neighbor.id, { sortOrder: plan.neighborNext })
       }
       await loadFirst()
     } catch {
@@ -215,6 +210,12 @@
   const formVisible = ref(false)
   const editing = ref<Api.Ads.Item | null>(null)
 
+  /** 新建追加位：现有最大 sortOrder + 1（空列表=0）——尾部追加保证全序，
+      从源头杜绝并列簇（planAdjacentMove 并列分支仅为兜底保险） */
+  const nextSortOrder = computed(
+    () => items.value.reduce((max, item) => Math.max(max, item.sortOrder), -1) + 1
+  )
+
   function openCreate(): void {
     editing.value = null
     formVisible.value = true