diff --git a/src/components/Shell.tsx b/src/components/Shell.tsx
index 8d952df..b94d355 100644
--- a/src/components/Shell.tsx
+++ b/src/components/Shell.tsx
@@ -1,4 +1,5 @@
-import { useState, useEffect, type ComponentType } from 'react';
+import { useState, useEffect, useMemo, type ComponentType } from 'react';
+import { useAuth } from '../auth/useAuth';
 
 export interface ModuleConfig {
   id: string;
@@ -55,8 +56,22 @@ export function Shell({ modules }: { modules: ModuleConfig[] }) {
 
   const ActiveComponent = modules.find((m) => m.id === activeModule)?.component ?? modules[0]?.component;
 
+  const { user } = useAuth();
+  const watermarkText = useMemo(() => {
+    const name = user?.userName || '未登录';
+    const time = new Date().toLocaleString('zh-CN', { year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false }).replace(/\//g, '-');
+    return `${name}-${time}`;
+  }, [user]);
+
   return (
     <div className="flex min-h-screen">
+      {/* 全局水印 */}
+      <div className="fixed inset-0 pointer-events-none z-[9999] overflow-hidden" style={{ opacity: 0.06 }}>
+        <div className="absolute inset-0" style={{
+          backgroundImage: `url("data:image/svg+xml,${encodeURIComponent(`<svg xmlns='http://www.w3.org/2000/svg' width='320' height='200'><text x='50%' y='50%' text-anchor='middle' dominant-baseline='middle' font-size='14' font-family='sans-serif' fill='%23000' transform='rotate(-25 160 100)'>${watermarkText}</text></svg>`)}")`,
+          backgroundRepeat: 'repeat',
+        }} />
+      </div>
       {/* Web 侧边栏 (md 及以上) */}
       <nav className="hidden md:flex flex-col items-center w-16 bg-white border-r border-gray-100 fixed top-0 left-0 h-full z-50 py-6 gap-2">
         {modules.map((m) => {
diff --git a/src/modules/assets/AssetsModule.tsx b/src/modules/assets/AssetsModule.tsx
index 67a728b..b204318 100644
--- a/src/modules/assets/AssetsModule.tsx
+++ b/src/modules/assets/AssetsModule.tsx
@@ -1,5 +1,4 @@
 import React, { useState, useEffect, useCallback, useMemo, useRef } from 'react';
-import { useAuth } from '../../auth/useAuth';
 import {
   Truck,
   Warehouse,
@@ -46,7 +45,6 @@ const TABS = [
 ];
 
 export default function AssetsModule() {
-  const { user } = useAuth();
   const [activeTab, setActiveTab] = useState<'overview' | 'department' | 'region' | 'customer'>('overview');
   const [tabReady, setTabReady] = useState(true);
   const prevTabRef = useRef(activeTab);
@@ -455,7 +453,6 @@ export default function AssetsModule() {
     }
   }, [customerData, customerChartView, customerProvinceData]);
 
-  const watermarkText = useMemo(() => `${user?.userName || '未登录'}-${new Date().toLocaleString('zh-CN', { year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false }).replace(/\//g, '-')}`, [lastUpdate, user]);
 
   if (loading && !summary) {
     return (
@@ -486,13 +483,6 @@ export default function AssetsModule() {
 
   return (
     <div className="min-h-screen bg-[#F8F9FB] text-gray-800 font-sans p-6 relative">
-      {/* Watermark */}
-      <div className="fixed inset-0 pointer-events-none z-[9999] overflow-hidden" style={{ opacity: 0.06 }}>
-        <div className="absolute inset-0" style={{
-          backgroundImage: `url("data:image/svg+xml,${encodeURIComponent(`<svg xmlns='http://www.w3.org/2000/svg' width='320' height='200'><text x='50%' y='50%' text-anchor='middle' dominant-baseline='middle' font-size='14' font-family='sans-serif' fill='%23000' transform='rotate(-25 160 100)'>${watermarkText}</text></svg>`)}")`,
-          backgroundRepeat: 'repeat',
-        }} />
-      </div>
       {/* Compact Header Bar */}
       <div className="sticky top-0 z-40 -mx-6 -mt-6 mb-4 bg-white/95 backdrop-blur-sm border-b border-gray-100/80">
         {/* Title row */}