diff --git a/apps/admin-web/src/pages/CityPartnersPage.tsx b/apps/admin-web/src/pages/CityPartnersPage.tsx
index 3a8dbbe..bcf7ab1 100644
--- a/apps/admin-web/src/pages/CityPartnersPage.tsx
+++ b/apps/admin-web/src/pages/CityPartnersPage.tsx
@@ -301,7 +301,16 @@ export default function CityPartnersPage() {
       ellipsis: true,
       render: (v) => v || '—',
     },
-    { title: '门店', dataIndex: 'storeCount', width: 60 },
+    {
+      title: '门店',
+      dataIndex: 'storeCount',
+      width: 60,
+      render: (n: number, row) => (
+        <Link to={`/stores?partnerId=${row.id}`} title={`查看「${row.companyName || row.phone}」门店`}>
+          {n ?? 0}
+        </Link>
+      ),
+    },
     { title: '子账号', dataIndex: 'accountCount', width: 70, render: (n) => Math.max(0, n - 1) },
     { title: '创建', dataIndex: 'createdAt', width: 150, render: fmtTime },
     {
@@ -444,7 +453,11 @@ export default function CityPartnersPage() {
           <>
             <Descriptions column={2} size="small" bordered style={{ marginBottom: 16 }}>
               <Descriptions.Item label="城市">{detail.cityName ?? '—'}</Descriptions.Item>
-              <Descriptions.Item label="门店数">{detail.storeCount ?? 0}</Descriptions.Item>
+              <Descriptions.Item label="门店数">
+                <Link to={`/stores?partnerId=${detail.id}`} title="查看该城市合伙人门店">
+                  {detail.storeCount ?? 0}
+                </Link>
+              </Descriptions.Item>
               <Descriptions.Item label="管仓仓库" span={2}>
                 {detail.managedWarehouseName ?? (
                   <Typography.Text type="secondary">
diff --git a/apps/admin-web/src/pages/StoresPage.tsx b/apps/admin-web/src/pages/StoresPage.tsx
index 305da2a..128d7f1 100644
--- a/apps/admin-web/src/pages/StoresPage.tsx
+++ b/apps/admin-web/src/pages/StoresPage.tsx
@@ -324,12 +324,16 @@ export default function StoresPage() {
   const navigate = useNavigate();
   const [searchParams] = useSearchParams();
   const initialCityId = searchParams.get('cityId') ?? '';
+  const initialPartnerId = searchParams.get('partnerId') ?? '';
   const [form] = Form.useForm();
   const [editForm] = Form.useForm();
   const [createForm] = Form.useForm<StoreCreateForm>();
-  const [filters, setFilters] = useState<Record<string, string>>(() =>
-    initialCityId ? { cityId: initialCityId } : {},
-  );
+  const [filters, setFilters] = useState<Record<string, string>>(() => {
+    const init: Record<string, string> = {};
+    if (initialCityId) init.cityId = initialCityId;
+    if (initialPartnerId) init.partnerId = initialPartnerId;
+    return init;
+  });
   const { data, loading, page, pageSize, setPage, setPageSize, reload } = useAdminList<StoreRow>(
     '/admin/stores',
     () => {
@@ -339,11 +343,13 @@ export default function StoresPage() {
       if (filters.auditStatus) qs.set('auditStatus', filters.auditStatus);
       if (filters.phone) qs.set('phone', filters.phone);
       if (filters.cityId) qs.set('cityId', filters.cityId);
+      if (filters.partnerId) qs.set('partnerId', filters.partnerId);
       return qs;
     },
     [filters],
   );
   const [filterCities, setFilterCities] = useState<CityOption[]>([]);
+  const [filterPartners, setFilterPartners] = useState<PartnerOption[]>([]);
   const [detail, setDetail] = useState<Record<string, unknown> | null>(null);
   const [drawerOpen, setDrawerOpen] = useState(false);
   const [rejectOpen, setRejectOpen] = useState(false);
@@ -366,19 +372,34 @@ export default function StoresPage() {
     void request<Paginated<CityOption>>(`/admin/cities?pageSize=${ADMIN_OPTIONS_PAGE_SIZE}`)
       .then((res) => setFilterCities(res.items))
       .catch(() => {});
+    void request<Paginated<PartnerOption>>(`/admin/partners?pageSize=${ADMIN_OPTIONS_PAGE_SIZE}`)
+      .then((res) => setFilterPartners(res.items))
+      .catch(() => {});
   }, []);
 
   useEffect(() => {
     const cityId = searchParams.get('cityId') ?? '';
+    const partnerId = searchParams.get('partnerId') ?? '';
+    let changed = false;
     setFilters((prev) => {
-      if ((prev.cityId ?? '') === cityId) return prev;
       const next = { ...prev };
-      if (cityId) next.cityId = cityId;
-      else delete next.cityId;
-      return next;
+      if ((prev.cityId ?? '') !== cityId) {
+        changed = true;
+        if (cityId) next.cityId = cityId;
+        else delete next.cityId;
+      }
+      if ((prev.partnerId ?? '') !== partnerId) {
+        changed = true;
+        if (partnerId) next.partnerId = partnerId;
+        else delete next.partnerId;
+      }
+      return changed ? next : prev;
     });
-    form.setFieldsValue({ cityId: cityId || undefined });
-    if (cityId) setPage(1);
+    form.setFieldsValue({
+      cityId: cityId || undefined,
+      partnerId: partnerId || undefined,
+    });
+    if (cityId || partnerId) setPage(1);
   }, [searchParams, form, setPage]);
 
   const selectedPartnerId = Form.useWatch('partnerAccountId', createForm);
@@ -452,7 +473,12 @@ export default function StoresPage() {
       // 以门店手机号为准保存；若与账号登录号不一致，保存时会强制同步到登录账号
       phone: storePhone || loginPhone,
       intro: d.intro,
-      benefitUsageRule: d.benefitUsageRule,
+      benefitUsageRule:
+        d.benefitUsageRule != null &&
+        String(d.benefitUsageRule).trim() &&
+        !/^null$/i.test(String(d.benefitUsageRule).trim())
+          ? String(d.benefitUsageRule)
+          : '',
       coverUrl: d.coverUrl,
       province: d.province,
       city: d.cityName,
@@ -490,7 +516,12 @@ export default function StoresPage() {
         phone: v.phone,
         coverUrl: v.coverUrl,
         intro: v.intro,
-        benefitUsageRule: v.benefitUsageRule ?? null,
+        benefitUsageRule:
+          typeof v.benefitUsageRule === 'string' &&
+          v.benefitUsageRule.trim() &&
+          !/^null$/i.test(v.benefitUsageRule.trim())
+            ? v.benefitUsageRule.trim()
+            : null,
         categoryId: v.categoryId,
         province: v.province,
         city: v.city,
@@ -761,6 +792,16 @@ export default function StoresPage() {
             options={filterCities.map((c) => ({ value: c.id, label: c.name }))}
           />
         </Form.Item>
+        <Form.Item name="partnerId" label="城市合伙人">
+          <Select
+            allowClear
+            showSearch
+            optionFilterProp="label"
+            style={{ width: 180 }}
+            placeholder="全部"
+            options={filterPartners.map((p) => ({ value: p.id, label: p.companyName || p.id }))}
+          />
+        </Form.Item>
         <Form.Item name="status" label="营业状态">
           <Select allowClear style={{ width: 100 }} placeholder="全部" options={Object.entries(STORE_STATUS_LABELS).map(([value, label]) => ({ value, label }))} />
         </Form.Item>
@@ -779,7 +820,9 @@ export default function StoresPage() {
               form.resetFields();
               setFilters({});
               setPage(1);
-              if (searchParams.has('cityId')) navigate('/stores', { replace: true });
+              if (searchParams.has('cityId') || searchParams.has('partnerId')) {
+                navigate('/stores', { replace: true });
+              }
             }}
           >
             重置
diff --git a/apps/h5-partner/src/pages/StoreDetailPage.tsx b/apps/h5-partner/src/pages/StoreDetailPage.tsx
index 8e83366..2aa3ace 100644
--- a/apps/h5-partner/src/pages/StoreDetailPage.tsx
+++ b/apps/h5-partner/src/pages/StoreDetailPage.tsx
@@ -67,7 +67,10 @@ export default function StoreDetailPage() {
       phone: String(data.phone || ''),
       address: String(data.address || ''),
       intro: String(data.intro || ''),
-      benefitUsageRule: String(data.benefitUsageRule || ''),
+      benefitUsageRule: (() => {
+        const raw = String(data.benefitUsageRule || '').trim();
+        return raw && !/^null$/i.test(raw) ? raw : '';
+      })(),
       latitude: data.latitude != null && data.latitude !== '' ? String(data.latitude) : '',
       longitude: data.longitude != null && data.longitude !== '' ? String(data.longitude) : '',
     });
diff --git a/apps/mini-user/src/pages/store-detail/index.tsx b/apps/mini-user/src/pages/store-detail/index.tsx
index 3c0efec..35ca786 100644
--- a/apps/mini-user/src/pages/store-detail/index.tsx
+++ b/apps/mini-user/src/pages/store-detail/index.tsx
@@ -174,7 +174,9 @@ export default function StoreDetailPage() {
   ]);
 
   const intro = store.intro?.trim() || '';
-  const benefitRule = store.benefitUsageRule?.trim() || '';
+  const benefitRuleRaw = store.benefitUsageRule?.trim() || '';
+  const benefitRule =
+    benefitRuleRaw && !/^null$/i.test(benefitRuleRaw) ? benefitRuleRaw : '';
 
   function previewEnv(index: number) {
     if (!envPhotos.length) return;
diff --git a/server/dukang-api/src/modules/ops/admin-stores.service.ts b/server/dukang-api/src/modules/ops/admin-stores.service.ts
index 07f0a7c..417fe68 100644
--- a/server/dukang-api/src/modules/ops/admin-stores.service.ts
+++ b/server/dukang-api/src/modules/ops/admin-stores.service.ts
@@ -17,6 +17,14 @@ import type {
   UpdateStoreStatusDto,
 } from './dto/admin-mutate.dto';
 
+/** 选填文案：空 / null / "null" 一律存库为 null，避免 String(null)==="null" */
+function normalizeStoreOptionalText(value: unknown): string | null {
+  if (value == null) return null;
+  const s = String(value).trim();
+  if (!s || /^null$/i.test(s) || /^undefined$/i.test(s)) return null;
+  return s;
+}
+
 @Injectable()
 export class AdminStoresService {
   constructor(
@@ -286,7 +294,7 @@ export class AdminStoresService {
           ...(normalizedPhone !== undefined ? { phone: normalizedPhone } : {}),
           ...(dto.intro !== undefined ? { intro: dto.intro } : {}),
           ...(dto.benefitUsageRule !== undefined
-            ? { benefitUsageRule: String(dto.benefitUsageRule).trim() || null }
+            ? { benefitUsageRule: normalizeStoreOptionalText(dto.benefitUsageRule) }
             : {}),
           ...(dto.address !== undefined ? { address: dto.address.trim() } : {}),
           ...(dto.province !== undefined ? { province: dto.province.trim() } : {}),
@@ -417,7 +425,7 @@ export class AdminStoresService {
     if (intro && (intro.length < 2 || intro.length > 500)) {
       throw new BadRequestException('门店简介须为 2~500 字');
     }
-    const benefitUsageRule = dto.benefitUsageRule?.trim() || null;
+    const benefitUsageRule = normalizeStoreOptionalText(dto.benefitUsageRule);
     if (benefitUsageRule && benefitUsageRule.length > 1000) {
       throw new BadRequestException('好客权益券使用规则最多 1000 字');
     }
diff --git a/server/dukang-api/src/modules/store/store.service.ts b/server/dukang-api/src/modules/store/store.service.ts
index e38aed8..cb7ae83 100644
--- a/server/dukang-api/src/modules/store/store.service.ts
+++ b/server/dukang-api/src/modules/store/store.service.ts
@@ -28,6 +28,14 @@ function haversineMeters(lat1: number, lng1: number, lat2: number, lng2: number)
   return 2 * R * Math.asin(Math.min(1, Math.sqrt(a)));
 }
 
+/** 选填文案：空 / null / "null" 存库为 null，避免 String(null)==="null" */
+function normalizeOptionalTextField(value: unknown): string | null {
+  if (value == null) return null;
+  const s = String(value).trim();
+  if (!s || /^null$/i.test(s) || /^undefined$/i.test(s)) return null;
+  return s;
+}
+
 function parseOptionalCoord(value: unknown, kind: 'lat' | 'lng' = 'lng'): number | null {
   if (value == null || value === '') return null;
   const n = typeof value === 'number' ? value : Number(value);
@@ -301,9 +309,8 @@ export class StoreService {
     if (introRaw && (introRaw.length < 2 || introRaw.length > 500)) {
       throw new BadRequestException('门店简介须为 2~500 字');
     }
-    const benefitUsageRuleRaw =
-      body.benefitUsageRule != null ? String(body.benefitUsageRule).trim() : '';
-    if (benefitUsageRuleRaw.length > 1000) {
+    const benefitUsageRuleRaw = normalizeOptionalTextField(body.benefitUsageRule);
+    if (benefitUsageRuleRaw && benefitUsageRuleRaw.length > 1000) {
       throw new BadRequestException('好客权益券使用规则最多 1000 字');
     }
 
@@ -325,7 +332,7 @@ export class StoreService {
         district: String(body.district ?? ''),
         address: String(body.address),
         intro: introRaw || null,
-        benefitUsageRule: benefitUsageRuleRaw || null,
+        benefitUsageRule: benefitUsageRuleRaw,
         avgPrice: avgPriceRaw,
         openTime,
         closeTime,
@@ -522,7 +529,9 @@ export class StoreService {
     const address = body.address !== undefined ? String(body.address).trim() : undefined;
     const introRaw = body.intro !== undefined ? String(body.intro).trim() : undefined;
     const benefitUsageRuleRaw =
-      body.benefitUsageRule !== undefined ? String(body.benefitUsageRule).trim() : undefined;
+      body.benefitUsageRule !== undefined
+        ? normalizeOptionalTextField(body.benefitUsageRule)
+        : undefined;
     const latitude =
       body.latitude !== undefined ? parseOptionalCoord(body.latitude, 'lat') : undefined;
     const longitude =
@@ -536,7 +545,7 @@ export class StoreService {
     if (introRaw && (introRaw.length < 2 || introRaw.length > 500)) {
       throw new BadRequestException('门店简介须为 2~500 字');
     }
-    if (benefitUsageRuleRaw !== undefined && benefitUsageRuleRaw.length > 1000) {
+    if (benefitUsageRuleRaw != null && benefitUsageRuleRaw.length > 1000) {
       throw new BadRequestException('好客权益券使用规则最多 1000 字');
     }
     if (
@@ -561,7 +570,7 @@ export class StoreService {
         ...(hasCoordsUpdate ? { latitude, longitude } : {}),
         ...(introRaw !== undefined ? { intro: introRaw || null } : {}),
         ...(benefitUsageRuleRaw !== undefined
-          ? { benefitUsageRule: benefitUsageRuleRaw || null }
+          ? { benefitUsageRule: benefitUsageRuleRaw }
           : {}),
         ...(resubmitAudit
           ? {