diff --git a/admin/arco-design-pro-vite/src/views/safety/platform-config/index.vue b/admin/arco-design-pro-vite/src/views/safety/platform-config/index.vue
index 9e0f6a4..3cdcb85 100644
--- a/admin/arco-design-pro-vite/src/views/safety/platform-config/index.vue
+++ b/admin/arco-design-pro-vite/src/views/safety/platform-config/index.vue
@@ -724,7 +724,7 @@
                   </a-col>
                   <a-col :span="8">
                     <a-form-item label="目标测试用户 ID (UID)">
-                      <a-input-number v-model="testMsgForm.targetUserId" placeholder="例如：1001" :min="1" />
+                      <a-input-number v-model="testMsgForm.targetUserId" placeholder="请输入真实微信登录用户 UID（如 2010）" :min="1" />
                     </a-form-item>
                   </a-col>
                   <a-col :span="8">
@@ -1394,7 +1394,7 @@ const loadingTemplates = ref(false);
 const wechatTemplates = ref<any>(null);
 const testMsgForm = reactive({
   templateType: 'order_status',
-  targetUserId: 1001,
+  targetUserId: null,
   previewTitle: '订单履约开始提醒',
   previewDetail: '您的同城生活陪伴订单已开始服务，请出示4位核销码完成现场确认。'
 });
diff --git a/server/src/index.ts b/server/src/index.ts
index e358254..4ef7d6c 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -250,12 +250,20 @@ async function assertUserNotBanned(userId: number, actionName: string = '操作'
   }
 }
 
-// 读取用户微信 openid（用于微信官方内容安全 security.msgSecCheck 溯源），失败返回 undefined
+// 微信 openid 形如 28 位字母数字（o 开头）；演示种子数据里的 wx_openid_1001 不是真实 openid
+function isPlausibleWechatOpenid(openid: any): boolean {
+  const value = String(openid || '').trim();
+  if (!value) return false;
+  if (/^wx_openid_/i.test(value)) return false;
+  return /^[A-Za-z0-9_-]{20,64}$/.test(value);
+}
+
+// 读取用户微信 openid（用于微信官方内容安全 security.msgSecCheck 溯源），失败或非真实 openid 返回 undefined
 async function resolveUserOpenid(userId: number): Promise<string | undefined> {
   try {
     const [rows]: any = await pool.query('SELECT wechat_openid FROM users WHERE id = ? LIMIT 1', [Number(userId)]);
     const openid = rows && rows[0] && rows[0].wechat_openid;
-    return openid ? String(openid) : undefined;
+    return isPlausibleWechatOpenid(openid) ? String(openid) : undefined;
   } catch (_) {
     return undefined;
   }
@@ -2789,7 +2797,10 @@ async function notifyBySubscribe(
 
     const [uRows]: any = await pool.query('SELECT wechat_openid FROM users WHERE id = ? LIMIT 1', [uid]);
     const openid = uRows && uRows[0] && uRows[0].wechat_openid;
-    if (!openid) return;
+    if (!isPlausibleWechatOpenid(openid)) {
+      logServerError('notifyBySubscribe', new Error(`订阅消息[${templateKey}]跳过：用户 ${uid} 没有有效的微信 openid`));
+      return;
+    }
 
     const accessToken = await getWechatAccessToken(appId, appSecret);
     const result = await sendSubscribeMessageHttp(accessToken, {
@@ -4444,12 +4455,15 @@ app.post('/api/admin/message/test-send', async (req: Request, res: Response) =>
 
     const cfg = await resolveWechatPayRuntimeConfig();
     const [uRows]: any = await pool.query('SELECT wechat_openid FROM users WHERE id = ? LIMIT 1', [Number(targetUserId) || 0]);
-    const openid = uRows && uRows[0] && uRows[0].wechat_openid;
+    const openidRaw = uRows && uRows[0] && uRows[0].wechat_openid;
+    const openidValid = isPlausibleWechatOpenid(openidRaw);
+    const openid = openidValid ? String(openidRaw) : '';
 
     const diagnostics = {
       enablePush,
       hasTemplateId: Boolean(templateId),
-      hasOpenid: Boolean(openid),
+      hasOpenid: Boolean(openidRaw),
+      openidValid,
       hasAppId: Boolean(cfg.appId),
       hasAppSecret: Boolean(cfg.appSecret),
       appIdMasked: maskTail(cfg.appId),
@@ -4517,9 +4531,11 @@ app.post('/api/admin/message/test-send', async (req: Request, res: Response) =>
       ? '订阅消息总开关未开启'
       : (!templateId
         ? `未配置「${typeLabels[tKey] || tKey}」模板ID${reasonDetail}${tKey === 'verifyCode' ? '（该类型为可选：核销码已随「订单状态提醒」的温馨提示下发）' : ''}`
-        : (!openid
+        : (!openidRaw
           ? `目标用户(ID=${targetUserId || 0})没有 wechat_openid（该用户需通过微信登录过小程序）`
-          : '小程序 appId/appSecret 未配置'));
+          : (!openidValid
+            ? `目标用户(ID=${targetUserId || 0})的 openid 不是有效微信 openid（演示种子账号），请改用真实微信登录用户测试`
+            : '小程序 appId/appSecret 未配置')));
     const result = {
       templateType: tKey,
       targetUserId: targetUserId || 1001,
diff --git a/server/tests/system-alerts-audit.spec.ts b/server/tests/system-alerts-audit.spec.ts
index 1ddf275..c109df1 100644
--- a/server/tests/system-alerts-audit.spec.ts
+++ b/server/tests/system-alerts-audit.spec.ts
@@ -53,4 +53,11 @@ describe('第一百批系统告警与后台审计', () => {
     expect(backupScript).toContain('gzip -t');
     expect(backupScript).toContain("-mtime +14 -delete");
   });
+
+  it('订阅消息必须识别演示账号的假 openid，避免 40003', () => {
+    expect(indexCode).toContain('function isPlausibleWechatOpenid');
+    expect(indexCode).toContain("if (/^wx_openid_/i.test(value)) return false;");
+    expect(indexCode).toContain('openidValid');
+    expect(indexCode).toContain('请改用真实微信登录用户测试');
+  });
 });