diff --git a/packages/server/src/services/hermes/gateway-manager.ts b/packages/server/src/services/hermes/gateway-manager.ts
index be4a423..5154db6 100644
--- a/packages/server/src/services/hermes/gateway-manager.ts
+++ b/packages/server/src/services/hermes/gateway-manager.ts
@@ -49,6 +49,7 @@ const execFileAsync = promisify(execFile)
 
 const HERMES_BASE = detectHermesHome()
 const HERMES_BIN = getHermesBin()
+const DEFAULT_WEB_UI_PORT = 8648
 
 /**
  * 检测系统的 init 系统（服务管理器）
@@ -174,6 +175,11 @@ export function buildGatewayProcessEnv(profileName: string, hermesHome: string):
   }
 }
 
+function getWebUiPort(): number | null {
+  const port = parseInt(process.env.PORT || String(DEFAULT_WEB_UI_PORT), 10)
+  return port > 0 && port <= 65535 ? port : null
+}
+
 // ============================
 // 类型定义
 // ============================
@@ -472,6 +478,8 @@ export class GatewayManager {
         usedPorts.add(gw.port)
       }
     }
+    const webUiPort = getWebUiPort()
+    if (webUiPort !== null) usedPorts.add(webUiPort)
 
     const port = await this.findFreePort(8642, host, usedPorts)
     if (configuredPort !== port) {
diff --git a/tests/server/gateway-manager.test.ts b/tests/server/gateway-manager.test.ts
index 76b2b94..e08b580 100644
--- a/tests/server/gateway-manager.test.ts
+++ b/tests/server/gateway-manager.test.ts
@@ -170,3 +170,20 @@ describe('GatewayManager gateway process env', () => {
     expect(env.CUSTOM_GATEWAY_SETTING).toBe('from-parent')
   })
 })
+
+describe('GatewayManager gateway port allocation', () => {
+  it('skips the Web UI listen port when assigning gateway ports', async () => {
+    const home = createHermesHome()
+    mkdirSync(join(home, 'profiles', 'work'), { recursive: true })
+    process.env.HERMES_HOME = home
+    process.env.PORT = '8648'
+    vi.resetModules()
+    const { GatewayManager } = await import('../../packages/server/src/services/hermes/gateway-manager')
+    const manager = new GatewayManager('default') as any
+    manager.allocatedPorts = new Set([8642, 8643, 8644, 8645, 8646, 8647])
+
+    const endpoint = await manager.resolvePort('work')
+
+    expect(endpoint.port).toBe(8649)
+  })
+})