diff --git a/src/Main.java b/src/Main.java
index e69de29..432a450 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -0,0 +1,40 @@
+import auth.AuthService;
+import model.Level;
+import model.User;
+
+import java.util.Scanner;
+
+public class Main {
+    private static final AuthService.TestPaperService testPaperService = new AuthService.TestPaperService();
+    private static User currentUser = null;
+    private static Level currentLevel = null;
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        while (true) {
+            if (currentUser == null) {
+                handleLogin(scanner);
+            } else {
+                handleQuestionGeneration(scanner);
+            }
+        }
+    }
+
+    private static void handleLogin(Scanner scanner) {
+        System.out.println("**********数学试卷生成项目**********");
+        System.out.println("请输入用户名和密码，用空格隔开:");
+        String[] input = scanner.nextLine().split(" ");
+        if (input.length == 2) {
+            authService.login(input[0], input[1]).ifPresentOrElse(
+                    user -> {
+                        currentUser = user;
+                        currentLevel = user.getLevel();
+                        System.out.printf("当前选择为%s出题%n", currentLevel.getName()); // 登录成功提示
+                    },
+                    () -> System.out.println("请输入正确的用户名、密码") // 登录失败提示
+            );
+        } else {
+            System.out.println("输入格式不正确，请重新输入。");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/auth/AuthService.java b/src/auth/AuthService.java
new file mode 100644
index 0000000..3c19cf6
--- /dev/null
+++ b/src/auth/AuthService.java
@@ -0,0 +1,25 @@
+package auth;
+
+import model.Level;
+import model.User;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class AuthService {
+    private final List<User> users;
+
+    public AuthService() {
+        this.users = new ArrayList<>();
+        // 初始化用户账户
+        users.add(new User("张三1", "123", Level.ELEMENTARY));
+        users.add(new User("张三2", "123", Level.ELEMENTARY));
+        users.add(new User("张三3", "123", Level.ELEMENTARY));
+        users.add(new User("李四1", "123", Level.JUNIOR_HIGH));
+        users.add(new User("李四2", "123", Level.JUNIOR_HIGH));
+        users.add(new User("李四3", "123", Level.JUNIOR_HIGH));
+        users.add(new User("王五1", "123", Level.SENIOR_HIGH));
+        users.add(new User("王五2", "123", Level.SENIOR_HIGH));
+        users.add(new User("王五3", "123", Level.SENIOR_HIGH));
+    }
+}
diff --git a/src/model/Level.java b/src/model/Level.java
new file mode 100644
index 0000000..577175e
--- /dev/null
+++ b/src/model/Level.java
@@ -0,0 +1,26 @@
+package model;
+
+public enum Level {
+    ELEMENTARY("小学"),
+    JUNIOR_HIGH("初中"),
+    SENIOR_HIGH("高中");
+
+    private final String name;
+
+    Level(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public static Level fromString(String text) {
+        for (Level b : Level.values()) {
+            if (b.name.equalsIgnoreCase(text)) {
+                return b;
+            }
+        }
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/src/model/User.java b/src/model/User.java
new file mode 100644
index 0000000..781739f
--- /dev/null
+++ b/src/model/User.java
@@ -0,0 +1,25 @@
+package model;
+
+public class User {
+    private final String username;
+    private final String password;
+    private final Level level;
+
+    public User(String username, String password, Level level) {
+        this.username = username;
+        this.password = password;
+        this.level = level;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public Level getLevel() {
+        return level;
+    }
+}
\ No newline at end of file