diff --git a/README.md b/README.md
index 165e3b4..4d33cfd 100644
--- a/README.md
+++ b/README.md
@@ -145,7 +145,7 @@
 - **播放器联动**：暂停时弹幕冻结，跳转时自动清除，全屏模式下正常显示
 - **多 API 管理**：每个用户可添加多个弹幕 API，选择当前使用的 API
 - **优先级规则**：用户选择的弹幕 API 优先于系统默认配置
-- **环境变量预设**：可通过 `NEXT_PUBLIC_DANMAKU_API_URL` 为所有用户预设弹幕 API 地址
+- **环境变量预设**：可通过 `DANMAKU_API_URL` 或 `NEXT_PUBLIC_DANMAKU_API_URL` 为所有用户预设弹幕 API 地址
 
 ### 广告过滤
 
@@ -456,7 +456,7 @@ docker run -d -p 3000:3000 \
 
 | 变量名 | 说明 | 默认值 |
 |--------|------|--------|
-| `NEXT_PUBLIC_DANMAKU_API_URL` | 弹幕聚合 API 地址 | - |
+| `DANMAKU_API_URL` / `NEXT_PUBLIC_DANMAKU_API_URL` | 弹幕聚合 API 地址 | - |
 
 需要自建或使用兼容 [danmu_api](https://github.com/huangxd-/danmu_api) 格式的弹幕聚合服务。
 
@@ -611,7 +611,7 @@ docker run -e PORT=8080 -p 8080:8080 --name kvideo kuekhaoyang/kvideo:latest
 | `MERGE_SOURCES` / `NEXT_PUBLIC_MERGE_SOURCES` | 启用合并同名源显示（`true`/`1`） | - |
 | `AD_KEYWORDS` / `NEXT_PUBLIC_AD_KEYWORDS` | 广告过滤关键词 | - |
 | `AD_KEYWORDS_FILE` | 广告关键词文件路径 | - |
-| `NEXT_PUBLIC_DANMAKU_API_URL` | 弹幕聚合 API 地址 | - |
+| `DANMAKU_API_URL` / `NEXT_PUBLIC_DANMAKU_API_URL` | 弹幕聚合 API 地址 | - |
 | `UPSTASH_REDIS_REST_URL` | Upstash Redis REST URL（跨设备同步：配置、历史、收藏） | - |
 | `UPSTASH_REDIS_REST_TOKEN` | Upstash Redis REST Token | - |
 
diff --git a/app/api/auth/route.ts b/app/api/auth/route.ts
index eae7d08..c9f7c5c 100644
--- a/app/api/auth/route.ts
+++ b/app/api/auth/route.ts
@@ -15,6 +15,7 @@ const PERSIST_SESSION = process.env.PERSIST_SESSION !== 'false'; // default true
 const SUBSCRIPTION_SOURCES = process.env.SUBSCRIPTION_SOURCES || process.env.NEXT_PUBLIC_SUBSCRIPTION_SOURCES || '';
 const IPTV_SOURCES = process.env.IPTV_SOURCES || process.env.NEXT_PUBLIC_IPTV_SOURCES || '';
 const MERGE_SOURCES = process.env.MERGE_SOURCES || process.env.NEXT_PUBLIC_MERGE_SOURCES || '';
+const DANMAKU_API_URL = process.env.DANMAKU_API_URL || process.env.NEXT_PUBLIC_DANMAKU_API_URL || '';
 
 // Backward compat: ACCESS_PASSWORD acts as ADMIN_PASSWORD if ADMIN_PASSWORD is not set
 const effectiveAdminPassword = ADMIN_PASSWORD || ACCESS_PASSWORD;
@@ -73,6 +74,7 @@ export async function GET() {
     subscriptionSources: SUBSCRIPTION_SOURCES,
     iptvSources: IPTV_SOURCES,
     mergeSources: MERGE_SOURCES,
+    danmakuApiUrl: DANMAKU_API_URL,
   });
 }
 
diff --git a/components/PasswordGate.tsx b/components/PasswordGate.tsx
index ae62ad9..ddb476e 100644
--- a/components/PasswordGate.tsx
+++ b/components/PasswordGate.tsx
@@ -53,6 +53,20 @@ function syncMergeSources(rawValue: string) {
     }
 }
 
+function syncDanmakuApiUrl(rawValue: string) {
+    if (!rawValue) return;
+
+    const buildTimeValue = process.env.NEXT_PUBLIC_DANMAKU_API_URL || '';
+
+    const settings = settingsStore.getSettings();
+    if (!settings.danmakuApiUrl || settings.danmakuApiUrl === buildTimeValue) {
+        settingsStore.saveSettings({
+            ...settings,
+            danmakuApiUrl: rawValue,
+        });
+    }
+}
+
 export function PasswordGate({ children, hasAuth: initialHasAuth }: { children: React.ReactNode, hasAuth: boolean }) {
     // Enable background subscription syncing globally
     useSubscriptionSync();
@@ -106,6 +120,10 @@ export function PasswordGate({ children, hasAuth: initialHasAuth }: { children:
                         syncMergeSources(data.mergeSources);
                     }
 
+                    if (data.danmakuApiUrl) {
+                        syncDanmakuApiUrl(data.danmakuApiUrl);
+                    }
+
                     // Re-evaluate lock status with confirmed server state
                     const confirmLocked = data.hasAuth && !isAuthenticated;
                     setIsLocked(confirmLocked);