diff --git a/README.md b/README.md
index c6b6d72..2d9d48e 100644
--- a/README.md
+++ b/README.md
@@ -109,6 +109,27 @@
 - **Service Worker**：离线缓存和智能预加载
 - **Server Components**：优化首屏加载性能
 - **Client Components**：复杂交互和状态管理
+### 🔒 访问控制
+
+- **环境级密码**：通过设置环境变量启用全局访问密码
+- **永久授权**：输入一次密码即可永久访问，无需重复验证
+- **本地管理**：支持在应用设置中添加多个自定义访问密码
+
+---
+
+## ⚙️ 环境配置
+
+如果需要为你的 KVideo 实例添加访问控制，可以设置以下环境变量：
+
+| 变量名 | 必填 | 默认值 | 说明 |
+|------|------|------|------|
+| `ACCESS_PASSWORD` | 否 | - | 设置后，所有访问者必须输入此密码才能使用应用。 |
+
+### 如何设置环境变量
+
+- **Vercel**: 在项目设置 -> Environment Variables 中添加 `ACCESS_PASSWORD`。
+- **Docker**: 使用 `-e ACCESS_PASSWORD=你的密码` 运行容器，或在 `docker-compose.yml` 中配置。
+- **本地开发**: 在项目根目录创建 `.env.local` 文件并添加 `ACCESS_PASSWORD=你的密码`。
 
 ## 🚀 快速部署
 
diff --git a/components/PasswordGate.tsx b/components/PasswordGate.tsx
index c506969..a2a5ee0 100644
--- a/components/PasswordGate.tsx
+++ b/components/PasswordGate.tsx
@@ -3,12 +3,14 @@
 import { useState, useEffect } from 'react';
 import { settingsStore } from '@/lib/store/settings-store';
 import { Lock } from 'lucide-react';
+import { verifyEnvPassword, isEnvPasswordRequired } from '@/lib/actions/auth';
 
-const SESSION_UNLOCKED_KEY = 'kvideo-unlocked';
+const ACCESS_GRANTED_KEY = 'kvideo-access-granted';
 
 export function PasswordGate({ children }: { children: React.ReactNode }) {
     const [isLocked, setIsLocked] = useState(true);
     const [password, setPassword] = useState('');
+    const [loading, setLoading] = useState(true);
     const [error, setError] = useState(false);
     const [isClient, setIsClient] = useState(false);
 
@@ -17,38 +19,59 @@ export function PasswordGate({ children }: { children: React.ReactNode }) {
         checkLockStatus();
     }, []);
 
-    const checkLockStatus = () => {
-        const settings = settingsStore.getSettings();
-        if (!settings.passwordAccess) {
+    const checkLockStatus = async () => {
+        const isAccessGranted = localStorage.getItem(ACCESS_GRANTED_KEY) === 'true';
+        if (isAccessGranted) {
             setIsLocked(false);
+            setLoading(false);
             return;
         }
 
-        const isUnlocked = sessionStorage.getItem(SESSION_UNLOCKED_KEY) === 'true';
-        if (isUnlocked) {
+        const envRequired = await isEnvPasswordRequired();
+        const settings = settingsStore.getSettings();
+
+        if (!envRequired && !settings.passwordAccess) {
             setIsLocked(false);
         } else {
             setIsLocked(true);
         }
+        setLoading(false);
     };
 
-    const handleUnlock = (e: React.FormEvent) => {
+    const handleUnlock = async (e: React.FormEvent) => {
         e.preventDefault();
-        const settings = settingsStore.getSettings();
-        if (settings.accessPasswords.includes(password)) {
-            sessionStorage.setItem(SESSION_UNLOCKED_KEY, 'true');
+        setLoading(true);
+
+        // Check against ENV password first
+        const isEnvValid = await verifyEnvPassword(password);
+        if (isEnvValid) {
+            localStorage.setItem(ACCESS_GRANTED_KEY, 'true');
             setIsLocked(false);
             setError(false);
-        } else {
-            setError(true);
-            // Shake animation trigger
-            const form = document.getElementById('password-form');
-            form?.classList.add('animate-shake');
-            setTimeout(() => form?.classList.remove('animate-shake'), 500);
+            setLoading(false);
+            return;
         }
+
+        // Check against local settings passwords
+        const settings = settingsStore.getSettings();
+        if (settings.accessPasswords.includes(password)) {
+            localStorage.setItem(ACCESS_GRANTED_KEY, 'true');
+            setIsLocked(false);
+            setError(false);
+            setLoading(false);
+            return;
+        }
+
+        // Invalid password
+        setError(true);
+        setLoading(false);
+        // Shake animation trigger
+        const form = document.getElementById('password-form');
+        form?.classList.add('animate-shake');
+        setTimeout(() => form?.classList.remove('animate-shake'), 500);
     };
 
-    if (!isClient) return null; // Prevent hydration mismatch
+    if (!isClient || loading) return null; // Prevent hydration mismatch and show nothing while checking
 
     if (!isLocked) {
         return <>{children}</>;
@@ -94,9 +117,10 @@ export function PasswordGate({ children }: { children: React.ReactNode }) {
 
                         <button
                             type="submit"
-                            className="w-full py-3 px-4 bg-[var(--accent-color)] text-white font-bold rounded-[var(--radius-2xl)] hover:translate-y-[-2px] hover:brightness-110 shadow-[var(--shadow-sm)] hover:shadow-[0_4px_8px_var(--shadow-color)] active:translate-y-0 active:scale-[0.98] transition-all duration-200"
+                            disabled={loading}
+                            className="w-full py-3 px-4 bg-[var(--accent-color)] text-white font-bold rounded-[var(--radius-2xl)] hover:translate-y-[-2px] hover:brightness-110 shadow-[var(--shadow-sm)] hover:shadow-[0_4px_8px_var(--shadow-color)] active:translate-y-0 active:scale-[0.98] transition-all duration-200 disabled:opacity-50"
                         >
-                            解锁访问
+                            {loading ? '正在验证...' : '解锁访问'}
                         </button>
                     </div>
                 </form>
diff --git a/lib/actions/auth.ts b/lib/actions/auth.ts
new file mode 100644
index 0000000..eed07cc
--- /dev/null
+++ b/lib/actions/auth.ts
@@ -0,0 +1,17 @@
+'use server';
+
+/**
+ * Verifies if the provided password matches the ACCESS_PASSWORD environment variable.
+ */
+export async function verifyEnvPassword(password: string): Promise<boolean> {
+    const accessPassword = process.env.ACCESS_PASSWORD;
+    if (!accessPassword) return false;
+    return password === accessPassword;
+}
+
+/**
+ * Checks if a password is required by checking the presence of ACCESS_PASSWORD in the environment.
+ */
+export async function isEnvPasswordRequired(): Promise<boolean> {
+    return !!process.env.ACCESS_PASSWORD;
+}