diff --git a/README.md b/README.md
deleted file mode 100644
index cea4d0e..0000000
--- a/README.md
+++ /dev/null
@@ -1,2 +0,0 @@
-# wanglei
-
diff --git a/doc/README.md b/doc/README.md
new file mode 100644
index 0000000..3e5709a
--- /dev/null
+++ b/doc/README.md
@@ -0,0 +1,156 @@
+# 中小学数学卷子自动生成程序
+
+## 项目简介
+
+这是一个为中小学数学老师设计的命令行卷子自动生成程序，支持小学、初中、高中三个难度级别。程序能够根据教师账户类型自动生成相应难度的数学题目，并确保题目不重复。
+
+##  功能特性
+
+- **用户认证系统** - 支持小学、初中、高中各三个预设账户
+- **多难度题目生成** - 根据不同学段生成相应难度的数学题目
+- **智能查重** - 确保同一教师的题目不重复
+- **灵活切换** - 支持在登录状态下切换出题难度
+- **自动保存** - 按用户分文件夹保存，文件命名规范
+
+## 预设账户
+
+| 账户类型 | 用户名 | 密码 |
+|---------|--------|------|
+| 小学 | 张三1, 张三2, 张三3 | 123 |
+| 初中 | 李四1, 李四2, 李四3 | 123 |
+| 高中 | 王五1, 王五2, 王五3 | 123 |
+
+## 题目难度要求
+
+### 小学题目
+- **运算符**: `+`, `-`, `*`, `/`, `()`
+- **要求**: 只能包含基本四则运算和括号
+- **示例**: `15 + (23 - 8) * 3 = `
+
+### 初中题目  
+- **运算符**: `+`, `-`, `*`, `/`, `()`, `²`, `√`
+- **要求**: 至少包含一个平方或开根号运算符
+- **示例**: `5² + √16 * 3 = `
+
+### 高中题目
+- **运算符**: `+`, `-`, `*`, `/`, `()`, `sin`, `cos`, `tan`
+- **要求**: 至少包含一个三角函数运算符
+- **示例**: `sin(45°) + cos(30°) * 2 = `
+
+##  技术架构
+
+### 项目结构
+src/
+├── Main.java # 程序入口
+├── User.java # 用户模型
+├── UserType.java # 用户类型枚举
+├── AuthManager.java # 认证管理器
+├── QuestionGenerator.java # 题目生成器接口
+├── PrimaryQuestionGenerator.java # 小学题目生成器
+├── JuniorQuestionGenerator.java # 初中题目生成器
+├── SeniorQuestionGenerator.java # 高中题目生成器
+├── QuestionGeneratorFactory.java # 工厂类
+├── QuestionService.java # 题目服务
+├── DuplicateChecker.java # 查重服务
+├── FileService.java # 文件服务
+└── Question.java # 题目模型
+
+text
+
+### 设计模式
+- **工厂模式** - 题目生成器工厂
+- **策略模式** - 不同难度的题目生成策略
+- **面向对象设计** - 类职责分离
+
+##  安装与运行
+
+### 环境要求
+- Java 8 或更高版本
+- 支持命令行操作的系统
+
+### 编译项目
+```bash
+# 进入项目src目录
+cd src
+
+# 编译所有Java文件
+javac *.java
+
+# 运行程序
+java Main
+使用说明
+1. 登录系统
+text
+=== 中小学数学卷子自动生成程序 ===
+请输入用户名和密码（用空格隔开）：
+张三1 123
+当前选择为小学出题
+2. 生成题目
+text
+准备生成小学数学题目，请输入生成题目数量（10-30，输入-1将退出当前用户，重新登录）：
+15
+题目生成完成！题目已保存到: questions/张三1/2025-01-20-14-30-25.txt
+3. 切换难度
+text
+切换为初中
+已切换为初中出题
+4. 退出登录
+text
+-1
+已退出当前用户
+文件保存规范
+目录结构
+text
+questions/
+├── 张三1/
+│   ├── 2025-01-20-14-30-25.txt
+│   └── 2025-01-20-15-45-10.txt
+├── 李四1/
+│   └── 2025-01-20-16-20-35.txt
+└── 王五1/
+    └── 2025-01-20-17-15-40.txt
+文件格式
+text
+1. 25 + 13 * (45 - 12) = 
+
+2. 15 / 3 + 28 = 
+
+3. (67 + 34) * 2 - 15 = 
+故障排除
+常见问题
+编译错误
+
+确保所有Java文件在同一目录下
+
+检查Java环境变量配置
+
+运行错误
+
+确认所有.class文件已生成
+
+检查文件读写权限
+
+题目生成失败
+
+确认输入题目数量在10-30范围内
+
+检查磁盘空间是否充足
+
+ 项目规范
+代码符合面向对象设计原则
+
+类职责单一，方法简洁
+
+包含完整的异常处理
+
+支持题目查重功能
+
+ 版本信息
+
+作者: 王磊
+
+班级: 软件2301
+
+学号：202326010106
+
+项目名称: 中小学数学卷子自动生成程序
\ No newline at end of file
diff --git a/src/AuthManager.java b/src/AuthManager.java
new file mode 100644
index 0000000..24cfcf3
--- /dev/null
+++ b/src/AuthManager.java
@@ -0,0 +1,25 @@
+import java.util.Arrays;
+import java.util.List;
+
+public class AuthManager {
+    private static final List<User> USERS = Arrays.asList(
+        new User("张三1", "123", UserType.PRIMARY),
+        new User("张三2", "123", UserType.PRIMARY),
+        new User("张三3", "123", UserType.PRIMARY),
+        new User("李四1", "123", UserType.JUNIOR),
+        new User("李四2", "123", UserType.JUNIOR),
+        new User("李四3", "123", UserType.JUNIOR),
+        new User("王五1", "123", UserType.SENIOR),
+        new User("王五2", "123", UserType.SENIOR),
+        new User("王五3", "123", UserType.SENIOR)
+    );
+
+    public User authenticate(String username, String password) {
+        for (User user : USERS) {
+            if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
+                return user;
+            }
+        }
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/src/DuplicateChecker.java b/src/DuplicateChecker.java
new file mode 100644
index 0000000..c7da4b7
--- /dev/null
+++ b/src/DuplicateChecker.java
@@ -0,0 +1,71 @@
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DuplicateChecker {
+    
+    public boolean isDuplicate(String username, String questionContent) {
+        String userDir = "questions/" + username + "/";
+        File dir = new File(userDir);
+        
+        if (!dir.exists()) {
+            return false;
+        }
+        
+        File[] files = dir.listFiles((d, name) -> name.endsWith(".txt"));
+        if (files == null) {
+            return false;
+        }
+        
+        for (File file : files) {
+            try {
+                List<String> lines = Files.readAllLines(Paths.get(file.getAbsolutePath()));
+                for (String line : lines) {
+                    if (line.trim().isEmpty()) continue;
+                    // 提取题目内容（去掉题号）
+                    String content = line.substring(line.indexOf('.') + 1).trim();
+                    if (content.equals(questionContent)) {
+                        return true;
+                    }
+                }
+            } catch (IOException e) {
+                System.err.println("读取文件失败: " + file.getName());
+            }
+        }
+        
+        return false;
+    }
+    
+    public List<String> getUserQuestions(String username) {
+        List<String> questions = new ArrayList<>();
+        String userDir = "questions/" + username + "/";
+        File dir = new File(userDir);
+        
+        if (!dir.exists()) {
+            return questions;
+        }
+        
+        File[] files = dir.listFiles((d, name) -> name.endsWith(".txt"));
+        if (files == null) {
+            return questions;
+        }
+        
+        for (File file : files) {
+            try {
+                List<String> lines = Files.readAllLines(Paths.get(file.getAbsolutePath()));
+                for (String line : lines) {
+                    if (line.trim().isEmpty()) continue;
+                    String content = line.substring(line.indexOf('.') + 1).trim();
+                    questions.add(content);
+                }
+            } catch (IOException e) {
+                System.err.println("读取文件失败: " + file.getName());
+            }
+        }
+        
+        return questions;
+    }
+}
\ No newline at end of file
diff --git a/src/FileService.java b/src/FileService.java
new file mode 100644
index 0000000..38a46a9
--- /dev/null
+++ b/src/FileService.java
@@ -0,0 +1,32 @@
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.List;
+
+public class FileService {
+    
+    public String saveQuestions(String username, List<Question> questions) throws IOException {
+        // 创建用户目录
+        String userDir = "questions/" + username + "/";
+        File dir = new File(userDir);
+        if (!dir.exists()) {
+            dir.mkdirs();
+        }
+        
+        // 生成文件名
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
+        String filename = userDir + timestamp + ".txt";
+        
+        // 写入文件
+        try (FileWriter writer = new FileWriter(filename)) {
+            for (int i = 0; i < questions.size(); i++) {
+                writer.write(questions.get(i).toString());
+                writer.write("\n\n"); // 题目之间空一行
+            }
+        }
+        
+        return filename;
+    }
+}
\ No newline at end of file
diff --git a/src/JuniorQuestionGenerator.java b/src/JuniorQuestionGenerator.java
new file mode 100644
index 0000000..362edfa
--- /dev/null
+++ b/src/JuniorQuestionGenerator.java
@@ -0,0 +1,47 @@
+import java.util.Random;
+
+public class JuniorQuestionGenerator implements QuestionGenerator {
+    private Random random = new Random();
+    private final String[] OPERATORS = {"+", "-", "*", "/"};
+
+    @Override
+    public String generateQuestion() {
+        int operandCount = random.nextInt(3) + 2; // 2-4个操作数
+        StringBuilder question = new StringBuilder();
+        
+        // 确保至少有一个平方或开根号
+        boolean hasSpecialOperator = false;
+        int specialOperatorPosition = random.nextInt(operandCount);
+        
+        for (int i = 0; i < operandCount; i++) {
+            if (i > 0) {
+                question.append(" ").append(OPERATORS[random.nextInt(OPERATORS.length)]).append(" ");
+            }
+            
+            // 在特定位置添加平方或开根号
+            if (i == specialOperatorPosition || !hasSpecialOperator) {
+                if (random.nextBoolean()) {
+                    // 平方
+                    int num = random.nextInt(20) + 1; // 1-20的平方
+                    question.append(num).append("²");
+                    hasSpecialOperator = true;
+                } else {
+                    // 开根号
+                    int num = random.nextInt(100) + 1; // 1-100开根号
+                    question.append("√").append(num);
+                    hasSpecialOperator = true;
+                }
+            } else {
+                question.append(random.nextInt(100) + 1);
+            }
+        }
+        
+        return question.toString() + " = ";
+    }
+
+    @Override
+    public boolean isValidQuestion(String question) {
+        return (question.contains("²") || question.contains("√")) && 
+               question.contains("=");
+    }
+}
\ No newline at end of file
diff --git a/src/PrimaryQuestionGenerator.java b/src/PrimaryQuestionGenerator.java
new file mode 100644
index 0000000..7c79686
--- /dev/null
+++ b/src/PrimaryQuestionGenerator.java
@@ -0,0 +1,41 @@
+import java.util.Random;
+
+public class PrimaryQuestionGenerator implements QuestionGenerator {
+    private Random random = new Random();
+    private final String[] OPERATORS = {"+", "-", "*", "/"};
+
+    @Override
+    public String generateQuestion() {
+        int operandCount = random.nextInt(3) + 2; // 2-4个操作数
+        StringBuilder question = new StringBuilder();
+        
+        // 随机决定是否添加括号
+        boolean hasParentheses = operandCount >= 3 && random.nextBoolean();
+        int parenthesesPosition = hasParentheses ? random.nextInt(operandCount - 1) : -1;
+        
+        for (int i = 0; i < operandCount; i++) {
+            if (i > 0) {
+                question.append(" ").append(OPERATORS[random.nextInt(OPERATORS.length)]).append(" ");
+            }
+            
+            if (hasParentheses && i == parenthesesPosition) {
+                question.append("(");
+            }
+            
+            question.append(random.nextInt(100) + 1); // 1-100
+            
+            if (hasParentheses && i == parenthesesPosition + 1) {
+                question.append(")");
+            }
+        }
+        
+        return question.toString() + " = ";
+    }
+
+    @Override
+    public boolean isValidQuestion(String question) {
+        return question.matches(".*[+\\-*/].*") && 
+               !question.matches(".*[√²sincostan].*") &&
+               question.contains("=");
+    }
+}
\ No newline at end of file
diff --git a/src/Question.java b/src/Question.java
new file mode 100644
index 0000000..50cb0f8
--- /dev/null
+++ b/src/Question.java
@@ -0,0 +1,20 @@
+public class Question {
+    private int number;
+    private String content;
+    private String userType;
+
+    public Question(int number, String content, String userType) {
+        this.number = number;
+        this.content = content;
+        this.userType = userType;
+    }
+
+    public int getNumber() { return number; }
+    public String getContent() { return content; }
+    public String getUserType() { return userType; }
+
+    @Override
+    public String toString() {
+        return number + ". " + content;
+    }
+}
\ No newline at end of file
diff --git a/src/QuestionGenerator.java b/src/QuestionGenerator.java
new file mode 100644
index 0000000..70bf9ae
--- /dev/null
+++ b/src/QuestionGenerator.java
@@ -0,0 +1,4 @@
+public interface QuestionGenerator {
+    String generateQuestion();
+    boolean isValidQuestion(String question);
+}
\ No newline at end of file
diff --git a/src/QuestionGeneratorFactory.java b/src/QuestionGeneratorFactory.java
new file mode 100644
index 0000000..7a5afe3
--- /dev/null
+++ b/src/QuestionGeneratorFactory.java
@@ -0,0 +1,14 @@
+public class QuestionGeneratorFactory {
+    public static QuestionGenerator createGenerator(UserType userType) {
+        switch (userType) {
+            case PRIMARY:
+                return new PrimaryQuestionGenerator();
+            case JUNIOR:
+                return new JuniorQuestionGenerator();
+            case SENIOR:
+                return new SeniorQuestionGenerator();
+            default:
+                throw new IllegalArgumentException("不支持的题目类型: " + userType);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/QuestionService.java b/src/QuestionService.java
new file mode 100644
index 0000000..314ce84
--- /dev/null
+++ b/src/QuestionService.java
@@ -0,0 +1,41 @@
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class QuestionService {
+    private DuplicateChecker duplicateChecker = new DuplicateChecker();
+    private FileService fileService = new FileService();
+    
+    public void generateAndSaveQuestions(User user, int count) {
+        QuestionGenerator generator = QuestionGeneratorFactory.createGenerator(user.getUserType());
+        List<Question> questions = new ArrayList<>();
+        int generated = 0;
+        int attempts = 0;
+        int maxAttempts = count * 10; // 防止无限循环
+        
+        while (generated < count && attempts < maxAttempts) {
+            String questionContent = generator.generateQuestion();
+            
+            // 检查题目是否有效且不重复
+            if (generator.isValidQuestion(questionContent) && 
+                !duplicateChecker.isDuplicate(user.getUsername(), questionContent)) {
+                
+                questions.add(new Question(generated + 1, questionContent, 
+                                         user.getUserType().getDisplayName()));
+                generated++;
+            }
+            attempts++;
+        }
+        
+        if (generated < count) {
+            System.out.println("警告：只生成了 " + generated + " 个不重复的题目（请求数量：" + count + "）");
+        }
+        
+        try {
+            String filename = fileService.saveQuestions(user.getUsername(), questions);
+            System.out.println("题目已保存到: " + filename);
+        } catch (IOException e) {
+            System.out.println("保存文件失败: " + e.getMessage());
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/SeniorQuestionGenerator.java b/src/SeniorQuestionGenerator.java
new file mode 100644
index 0000000..35206bc
--- /dev/null
+++ b/src/SeniorQuestionGenerator.java
@@ -0,0 +1,41 @@
+import java.util.Random;
+
+public class SeniorQuestionGenerator implements QuestionGenerator {
+    private Random random = new Random();
+    private final String[] OPERATORS = {"+", "-", "*", "/"};
+    private final String[] TRIG_FUNCTIONS = {"sin", "cos", "tan"};
+
+    @Override
+    public String generateQuestion() {
+        int operandCount = random.nextInt(3) + 2; // 2-4个操作数
+        StringBuilder question = new StringBuilder();
+        
+        // 确保至少有一个三角函数
+        boolean hasTrigFunction = false;
+        int trigFunctionPosition = random.nextInt(operandCount);
+        
+        for (int i = 0; i < operandCount; i++) {
+            if (i > 0) {
+                question.append(" ").append(OPERATORS[random.nextInt(OPERATORS.length)]).append(" ");
+            }
+            
+            // 在特定位置添加三角函数
+            if (i == trigFunctionPosition || !hasTrigFunction) {
+                String trigFunction = TRIG_FUNCTIONS[random.nextInt(TRIG_FUNCTIONS.length)];
+                int angle = random.nextInt(360); // 0-359度
+                question.append(trigFunction).append("(").append(angle).append("°)");
+                hasTrigFunction = true;
+            } else {
+                question.append(random.nextInt(100) + 1);
+            }
+        }
+        
+        return question.toString() + " = ";
+    }
+
+    @Override
+    public boolean isValidQuestion(String question) {
+        return (question.contains("sin") || question.contains("cos") || question.contains("tan")) && 
+               question.contains("=");
+    }
+}
\ No newline at end of file
diff --git a/src/User.java b/src/User.java
new file mode 100644
index 0000000..fadf54e
--- /dev/null
+++ b/src/User.java
@@ -0,0 +1,25 @@
+public class User {
+    private String username; 
+    private String password;
+    private UserType userType;
+
+    public User(String username, String password, UserType userType) {
+        this.username = username;
+        this.password = password;
+        this.userType = userType;
+    }
+
+    // Getters
+    public String getUsername() { return username; }
+    public String getPassword() { return password; }
+    public UserType getUserType() { return userType; }
+    
+    public void setUserType(UserType userType) {
+        this.userType = userType;
+    }
+
+    @Override
+    public String toString() {
+        return username + " (" + userType.getDisplayName() + ")";
+    }
+}
\ No newline at end of file
diff --git a/src/UserType.java b/src/UserType.java
new file mode 100644
index 0000000..82b9a91
--- /dev/null
+++ b/src/UserType.java
@@ -0,0 +1,24 @@
+public enum UserType {
+    PRIMARY("小学"),
+    JUNIOR("初中"),
+    SENIOR("高中");
+
+    private final String displayName;
+
+    UserType(String displayName) {
+        this.displayName = displayName;
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+
+    public static UserType fromDisplayName(String displayName) {
+        for (UserType type : values()) {
+            if (type.displayName.equals(displayName)) {
+                return type;
+            }
+        }
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/src/main.java b/src/main.java
new file mode 100644
index 0000000..1d62258
--- /dev/null
+++ b/src/main.java
@@ -0,0 +1,95 @@
+import java.util.Scanner;
+
+public class Main {
+    private static final AuthManager authManager = new AuthManager();
+    private static final QuestionService questionService = new QuestionService();
+    private static final Scanner scanner = new Scanner(System.in);
+    private static User currentUser = null;
+
+    public static void main(String[] args) {
+        System.out.println("=== 中小学数学卷子自动生成程序 ===");
+        
+        while (true) {
+            if (currentUser == null) {
+                login();
+            } else {
+                generateQuestions();
+            }
+        }
+    }
+
+    private static void login() {
+        System.out.println("请输入用户名和密码（用空格隔开）：");
+        try {
+            String input = scanner.nextLine().trim();
+            if (input.isEmpty()) {
+                return;
+            }
+            
+            String[] credentials = input.split("\\s+");
+            
+            if (credentials.length != 2) {
+                System.out.println("请输入正确的用户名、密码");
+                return;
+            }
+            
+            currentUser = authManager.authenticate(credentials[0], credentials[1]);
+            
+            if (currentUser == null) {
+                System.out.println("请输入正确的用户名、密码");
+            } else {
+                System.out.println("当前选择为" + currentUser.getUserType().getDisplayName() + "出题");
+            }
+        } catch (Exception e) {
+            System.out.println("输入格式错误，请重新输入");
+        }
+    }
+
+    private static void generateQuestions() {
+        System.out.println("准备生成" + currentUser.getUserType().getDisplayName() + 
+                          "数学题目，请输入生成题目数量（10-30，输入-1将退出当前用户，重新登录）：");
+        
+        try {
+            String input = scanner.nextLine().trim();
+            
+            if (input.startsWith("切换为")) {
+                handleSwitchCommand(input);
+                return;
+            }
+            
+            int count = Integer.parseInt(input);
+            
+            if (count == -1) {
+                currentUser = null;
+                System.out.println("已退出当前用户");
+                return;
+            }
+            
+            if (count < 10 || count > 30) {
+                System.out.println("题目数量范围应为10-30");
+                return;
+            }
+            
+            questionService.generateAndSaveQuestions(currentUser, count);
+            System.out.println("题目生成完成！可继续生成题目或输入-1退出登录");
+            
+        } catch (NumberFormatException e) {
+            System.out.println("请输入有效的数字");
+        } catch (Exception e) {
+            System.out.println("发生错误：" + e.getMessage());
+        }
+    }
+
+    private static void handleSwitchCommand(String command) {
+        String targetType = command.substring(3).trim();
+        
+        UserType newType = UserType.fromDisplayName(targetType);
+        if (newType == null) {
+            System.out.println("请输入小学、初中和高中三个选项中的一个");
+            return;
+        }
+        
+        currentUser.setUserType(newType);
+        System.out.println("已切换为" + currentUser.getUserType().getDisplayName() + "出题");
+    }
+}
\ No newline at end of file