diff --git a/.env b/.env
new file mode 100644
index 0000000..418e1d0
--- /dev/null
+++ b/.env
@@ -0,0 +1,2 @@
+PORT = 3000
+TZ = Asia/Taipei
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 1f3a00e..5add0e0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "name": "backend-.",
       "version": "0.1.0",
       "dependencies": {
+        "dotenv": "^16.0.0",
         "tsrpc": "^3.1.3"
       },
       "devDependencies": {
@@ -533,6 +534,14 @@
         "node": ">=0.3.1"
       }
     },
+    "node_modules/dotenv": {
+      "version": "16.0.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.0.0.tgz",
+      "integrity": "sha512-qD9WU0MPM4SWLPJy/r2Be+2WgQj8plChsyrCNQzW/0WjvcJQiKQJ9mH3ZgB3fxbUUxgc/11ZJ0Fi5KiimWGz2Q==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/editorconfig": {
       "version": "0.15.3",
       "resolved": "https://registry.npmjs.org/editorconfig/-/editorconfig-0.15.3.tgz",
@@ -2504,6 +2513,11 @@
       "integrity": "sha512-/VTCrvm5Z0JGty/BWHljh+BAiw3IK+2j87NGMu8Nwc/f48WoDAC395uomO9ZD117ZOBaHmkX1oyLvkVM/aIT3w==",
       "dev": true
     },
+    "dotenv": {
+      "version": "16.0.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.0.0.tgz",
+      "integrity": "sha512-qD9WU0MPM4SWLPJy/r2Be+2WgQj8plChsyrCNQzW/0WjvcJQiKQJ9mH3ZgB3fxbUUxgc/11ZJ0Fi5KiimWGz2Q=="
+    },
     "editorconfig": {
       "version": "0.15.3",
       "resolved": "https://registry.npmjs.org/editorconfig/-/editorconfig-0.15.3.tgz",
diff --git a/package.json b/package.json
index 8bbb607..cd47d49 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
     "typescript": "^4.5.2"
   },
   "dependencies": {
+    "dotenv": "^16.0.0",
     "tsrpc": "^3.1.3"
   }
 }
diff --git a/src/api/ApiJoin.ts b/src/api/ApiJoin.ts
index f03b9ce..f46e823 100644
--- a/src/api/ApiJoin.ts
+++ b/src/api/ApiJoin.ts
@@ -2,11 +2,11 @@ import { ApiCallWs } from "tsrpc";
 import { roomInstance } from "..";
 import { ReqJoin, ResJoin } from "../shared/protocols/PtlJoin";
 
-export async function ApiJoin(call: ApiCallWs<ReqJoin, ResJoin>) {
-    let playerId = roomInstance.join(call.req, call.conn);
+export async function ApiJoin(call: ApiCallWs<ReqJoin, ResJoin>): Promise<void> {
+    let playerId: number = roomInstance.join(call.req, call.conn);
 
     call.succ({
         playerId: playerId,
         gameState: roomInstance.gameSystem.state
-    })
+    });
 }
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index 9771703..e31e518 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,18 +1,19 @@
-import 'k8w-extend-native';
+import "k8w-extend-native";
 import * as path from "path";
 import { WsConnection, WsServer } from "tsrpc";
-import { Room } from './models/Room';
-import { serviceProto, ServiceType } from './shared/protocols/serviceProto';
+import { Room } from "./models/Room";
+import { serviceProto, ServiceType } from "./shared/protocols/serviceProto";
+require("dotenv").config();
 
 // 创建 TSRPC WebSocket Server
-export const server = new WsServer(serviceProto, {
-    port: 3000,
+export const server: WsServer<ServiceType> = new WsServer(serviceProto, {
+    port: +process.env.PORT! || 3000,
     json: true
 });
 
 // 断开连接后退出房间
 server.flows.postDisconnectFlow.push(v => {
-    let conn = v.conn as WsConnection<ServiceType>;
+    let conn: WsConnection<ServiceType> = v.conn as WsConnection<ServiceType>;
     if (conn.playerId) {
         roomInstance.leave(conn.playerId, conn);
     }
@@ -20,19 +21,19 @@ server.flows.postDisconnectFlow.push(v => {
     return v;
 });
 
-export const roomInstance = new Room(server);
+export const roomInstance: Room = new Room(server);
 
 // 初始化
-async function init() {
+async function init(): Promise<void> {
     // 挂载 API 接口
-    await server.autoImplementApi(path.resolve(__dirname, 'api'));
+    await server.autoImplementApi(path.resolve(__dirname, "api"));
 
     // TODO
     // Prepare something... (e.g. connect the db)
-};
+}
 
 // 启动入口点
-async function main() {
+async function main(): Promise<void> {
     await init();
     await server.start();
 }
diff --git a/src/models/Room.ts b/src/models/Room.ts
index f0e7951..f104ddc 100644
--- a/src/models/Room.ts
+++ b/src/models/Room.ts
@@ -23,78 +23,78 @@ export class Room {
 
     constructor(server: WsServer<ServiceType>) {
         this.server = server;
-        setInterval(() => { this.sync() }, 1000 / this.syncRate);
+        setInterval(() => { this.sync(); }, 1000 / this.syncRate);
     }
 
     /** 加入房间 */
-    join(req: ReqJoin, conn: WsConnection<ServiceType>) {
+    join(req: ReqJoin, conn: WsConnection<ServiceType>): number {
         let input: PlayerJoin = {
-            type: 'PlayerJoin',
+            type: "PlayerJoin",
             playerId: this.nextPlayerId++,
             // 初始位置随机
             pos: {
                 x: Math.random() * 10 - 5,
                 y: Math.random() * 10 - 5
             }
-        }
+        };
         this.applyInput(input);
 
         this.conns.push(conn);
         conn.playerId = input.playerId;
-        conn.listenMsg('client/ClientInput', call => {
+        conn.listenMsg("client/ClientInput", call => {
             this.playerLastSn[input.playerId] = call.msg.sn;
             call.msg.inputs.forEach(v => {
                 this.applyInput({
                     ...v,
                     playerId: input.playerId
                 });
-            })
+            });
         });
 
         return input.playerId;
     }
 
-    applyInput(input: GameSystemInput) {
+    applyInput(input: GameSystemInput): void {
         this.pendingInputs.push(input);
     }
 
-    sync() {
+    sync(): void {
         let inputs = this.pendingInputs;
         this.pendingInputs = [];
 
         // Apply inputs
         inputs.forEach(v => {
-            this.gameSystem.applyInput(v)
+            this.gameSystem.applyInput(v);
         });
 
         // Apply TimePast
         let now = process.uptime() * 1000;
         this.applyInput({
-            type: 'TimePast',
+            type: "TimePast",
             dt: now - (this.lastSyncTime ?? now)
         });
         this.lastSyncTime = now;
 
         // 发送同步帧
         this.conns.forEach(v => {
-            v.sendMsg('server/Frame', {
+            v.sendMsg("server/Frame", {
                 inputs: inputs,
                 lastSn: this.playerLastSn[v.playerId!]
-            })
+            });
         });
     }
 
     /** 离开房间 */
-    leave(playerId: number, conn: WsConnection<ServiceType>) {
+    leave(playerId: number, conn: WsConnection<ServiceType>): void {
         this.conns.removeOne(v => v.playerId === playerId);
         this.applyInput({
-            type: 'PlayerLeave',
+            type: "PlayerLeave",
             playerId: playerId
         });
     }
 }
 
-declare module 'tsrpc' {
+declare module "tsrpc" {
     export interface WsConnection {
         playerId?: number;
     }
diff --git a/src/shared/game/gameConfig.ts b/src/shared/game/gameConfig.ts
index ba58c6f..a09b1ad 100644
--- a/src/shared/game/gameConfig.ts
+++ b/src/shared/game/gameConfig.ts
@@ -11,4 +11,4 @@ export const gameConfig = {
     arrowAttackRadius: 2,
     // 被箭矢几种后的晕眩时间（毫秒）
     arrowDizzyTime: 1000
-}
\ No newline at end of file
+};
\ No newline at end of file
diff --git a/src/shared/protocols/PtlJoin.ts b/src/shared/protocols/PtlJoin.ts
index 8b44363..fdc851b 100644
--- a/src/shared/protocols/PtlJoin.ts
+++ b/src/shared/protocols/PtlJoin.ts
@@ -7,9 +7,9 @@ export interface ReqJoin {
 
 export interface ResJoin {
     /** 加入房间后，自己的 ID */
-    playerId: number,
+    playerId: number;
     /** 状态同步：一次性同步当前状态 */
-    gameState: GameSystemState
+    gameState: GameSystemState;
 }
 
 // export const conf = {}
\ No newline at end of file
diff --git a/src/shared/protocols/serviceProto.ts b/src/shared/protocols/serviceProto.ts
index 09ed1e8..f53f4bf 100644
--- a/src/shared/protocols/serviceProto.ts
+++ b/src/shared/protocols/serviceProto.ts
@@ -1,7 +1,7 @@
-import { ServiceProto } from 'tsrpc-proto';
-import { MsgClientInput } from './client/MsgClientInput';
-import { ReqJoin, ResJoin } from './PtlJoin';
-import { MsgFrame } from './server/MsgFrame';
+import { ServiceProto } from "tsrpc-proto";
+import { MsgClientInput } from "./client/MsgClientInput";
+import { ReqJoin, ResJoin } from "./PtlJoin";
+import { MsgFrame } from "./server/MsgFrame";
 
 export interface ServiceType {
     api: {
@@ -9,11 +9,11 @@ export interface ServiceType {
             req: ReqJoin,
             res: ResJoin
         }
-    },
+    };
     msg: {
         "client/ClientInput": MsgClientInput,
         "server/Frame": MsgFrame
-    }
+    };
 }
 
 export const serviceProto: ServiceProto<ServiceType> = {
diff --git a/test/api/ApiSend.test.ts b/test/api/ApiSend.test.ts
index d733be0..9a704a6 100644
--- a/test/api/ApiSend.test.ts
+++ b/test/api/ApiSend.test.ts
@@ -17,14 +17,14 @@ describe("ApiSend", function (): void {
     });
 
     it("Success", async function (): Promise<void> {
-        let ret: any = await client.callApi("Send", {
+        let ret: any = await client.callApi("Join", {
             content: "Test"
         });
-        assert.ok(ret.isSucc)
+        assert.ok(ret.isSucc);
     });
 
     it("Check content is empty", async function (): Promise<void> {
-        let ret: any = await client.callApi("Send", {
+        let ret: any = await client.callApi("Join", {
             content: ""
         });
         assert.deepStrictEqual(ret, {
@@ -33,7 +33,7 @@ describe("ApiSend", function (): void {
         });
     });
 
-    after(async function () {
+    after(async function (): Promise<void> {
         await client.disconnect();
     });
 });
\ No newline at end of file