diff --git a/doc/read.md b/doc/read.md
new file mode 100644
index 0000000..e69de29
diff --git a/src/DifficultyLevel.java b/src/DifficultyLevel.java
new file mode 100644
index 0000000..42b9913
--- /dev/null
+++ b/src/DifficultyLevel.java
@@ -0,0 +1,24 @@
+public enum DifficultyLevel {
+    PRIMARY("小学"),
+    JUNIOR("初中"),
+    SENIOR("高中");
+
+    private String chineseName;
+
+    DifficultyLevel(String chineseName) {
+        this.chineseName = chineseName;
+    }
+
+    public String getChineseName() {
+        return chineseName;
+    }
+
+    public static DifficultyLevel fromChineseName(String name) {
+        for (DifficultyLevel level : values()) {
+            if (level.chineseName.equals(name)) {
+                return level;
+            }
+        }
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/src/FileManager.java b/src/FileManager.java
new file mode 100644
index 0000000..76d8486
--- /dev/null
+++ b/src/FileManager.java
@@ -0,0 +1,23 @@
+import java.io.*;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class FileManager {
+    public void savePaper(String username, DifficultyLevel level, QuestionPaper paper) {
+        String folderPath = "papers/" + username + "/";
+        File folder = new File(folderPath);
+        if (!folder.exists()) {
+            folder.mkdirs();
+        }
+
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
+        String filePath = folderPath + timestamp + ".txt";
+
+        try (PrintWriter writer = new PrintWriter(new FileWriter(filePath))) {
+            writer.write(paper.getFormattedPaper());
+            System.out.println("试卷已保存至: " + filePath);
+        } catch (IOException e) {
+            System.out.println("保存文件时出错: " + e.getMessage());
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Main.java b/src/Main.java
new file mode 100644
index 0000000..979c552
--- /dev/null
+++ b/src/Main.java
@@ -0,0 +1,149 @@
+import java.util.*;
+
+public class Main {
+    private static Map<String, User> users = new HashMap<>();
+    private static Scanner scanner = new Scanner(System.in);
+    private static User currentUser = null;
+    private static QuestionGenerator generator = new QuestionGenerator();
+    private static FileManager fileManager = new FileManager();
+
+    public static void main(String[] args) {
+        initializeUsers();
+        showLoginPrompt();
+    }
+
+    private static void initializeUsers() {
+        // 小学用户
+        users.put("张三1", new User("张三1", "123", DifficultyLevel.PRIMARY));
+        users.put("张三2", new User("张三2", "123", DifficultyLevel.PRIMARY));
+        users.put("张三3", new User("张三3", "123", DifficultyLevel.PRIMARY));
+
+        // 初中用户
+        users.put("李四1", new User("李四1", "123", DifficultyLevel.JUNIOR));
+        users.put("李四2", new User("李四2", "123", DifficultyLevel.JUNIOR));
+        users.put("李四3", new User("李四3", "123", DifficultyLevel.JUNIOR));
+
+        // 高中用户
+        users.put("王五1", new User("王五1", "123", DifficultyLevel.SENIOR));
+        users.put("王五2", new User("王五2", "123", DifficultyLevel.SENIOR));
+        users.put("王五3", new User("王五3", "123", DifficultyLevel.SENIOR));
+    }
+
+    /*private static void showLoginPrompt() {
+        System.out.println("请输入用户名和密码（用空格隔开）:");
+
+        while (true) {
+            String input = scanner.nextLine().trim();
+            String[] credentials = input.split(" ");
+
+            if (credentials.length != 2) {
+                System.out.println("请输入正确的用户名、密码");
+                continue;
+            }
+
+            String username = credentials[0];
+            String password = credentials[1];
+
+            if (authenticateUser(username, password)) {
+                System.out.println("当前选择为" + currentUser.getLevel().getChineseName() + "出题");
+                showMainMenu();
+                break;
+            } else {
+                System.out.println("请输入正确的用户名、密码");
+            }
+        }
+    }*/
+
+    private static void showLoginPrompt() {
+        System.out.println("请输入用户名和密码（用空格隔开）:");
+
+        while (true) {
+            String input = scanner.nextLine().trim();
+            String[] credentials = input.split(" ");
+
+            if (credentials.length != 2) {
+                System.out.println("请输入正确的用户名、密码");
+                continue;
+            }
+
+            String username = credentials[0];
+            String password = credentials[1];
+
+            if (authenticateUser(username, password)) {
+                // 新增：加载该用户的历史题目
+                generator.loadUserHistory(username);
+                System.out.println("当前选择为" + currentUser.getLevel().getChineseName() + "出题");
+                showMainMenu();
+                break;
+            } else {
+                System.out.println("请输入正确的用户名、密码");
+            }
+        }
+    }
+
+    private static boolean authenticateUser(String username, String password) {
+        User user = users.get(username);
+        if (user != null && user.authenticate(username, password)) {
+            currentUser = new User(username, password, user.getLevel());
+            return true;
+        }
+        return false;
+    }
+
+    private static void showMainMenu() {
+        while (true) {
+            System.out.println("准备生成" + currentUser.getLevel().getChineseName() +
+                    "数学题目，请输入生成题目数量（输入-1将退出当前用户，重新登录）:");
+
+            String input = scanner.nextLine().trim();
+
+            if (input.equals("-1")) {
+                currentUser = null;
+                generator.clearHistory();
+                showLoginPrompt();
+                break;
+            }
+
+            if (input.startsWith("切换为")) {
+                handleLevelSwitch(input);
+                continue;
+            }
+
+            try {
+                int count = Integer.parseInt(input);
+                if (count >= 10 && count <= 30) {
+                    generatePaper(count);
+                } else {
+                    System.out.println("题目数量应在10-30之间");
+                }
+            } catch (NumberFormatException e) {
+                System.out.println("请输入有效的数字或'切换为XX'命令");
+            }
+        }
+    }
+
+    private static void handleLevelSwitch(String input) {
+        String levelName = input.substring(3).trim();
+        DifficultyLevel newLevel = DifficultyLevel.fromChineseName(levelName);
+
+        if (newLevel != null) {
+            currentUser.setLevel(newLevel);
+            System.out.println("准备生成" + newLevel.getChineseName() + "数学题目，请输入生成题目数量");
+        } else {
+            System.out.println("请输入小学、初中和高中三个选项中的一个");
+        }
+    }
+
+    private static void generatePaper(int questionCount) {
+        QuestionPaper paper = new QuestionPaper();
+
+        for (int i = 0; i < questionCount; i++) {
+            String question = generator.generateQuestion(currentUser.getLevel());
+            paper.addQuestion(question);
+        }
+
+        fileManager.savePaper(currentUser.getUsername(), currentUser.getLevel(), paper);
+        System.out.println("已生成" + questionCount + "道" +
+                currentUser.getLevel().getChineseName() + "数学题目");
+    }
+}
diff --git a/src/QuestionGenerator.java b/src/QuestionGenerator.java
new file mode 100644
index 0000000..5490d46
--- /dev/null
+++ b/src/QuestionGenerator.java
@@ -0,0 +1,201 @@
+import java.util.HashSet;
+import java.util.Random;
+import java.util.Set;
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+public class QuestionGenerator {private Random random = new Random();
+    private Set<String> generatedQuestions = new HashSet<>();
+    private Set<String> userHistoryQuestions = new HashSet<>(); // 新增：用户历史题目
+
+    // 新增方法：加载用户历史题目
+    public void loadUserHistory(String username) {
+        userHistoryQuestions.clear();
+        String folderPath = "papers/" + username + "/";
+        File folder = new File(folderPath);
+        if (!folder.exists()) return;
+
+        File[] files = folder.listFiles((dir, name) -> name.endsWith(".txt"));
+        if (files == null) return;
+
+        for (File file : files) {
+            try {
+                String content = new String(Files.readAllBytes(Paths.get(file.getPath())));
+                // 提取题目（每行一个题目，格式如：1. 题目内容）
+                String[] lines = content.split("\n");
+                for (String line : lines) {
+                    if (line.matches("^\\d+\\.\\s+.+")) {
+                        String question = line.substring(line.indexOf(".") + 1).trim();
+                        userHistoryQuestions.add(question);
+                    }
+                }
+            } catch (IOException e) {
+                System.out.println("读取历史文件失败: " + file.getName());
+            }
+        }
+    }
+
+    public String generateQuestion(DifficultyLevel level) {
+        String question;
+        int attempt = 0;
+        do {
+            question = generateSingleQuestion(level);
+            attempt++;
+            if (attempt > 100) {
+                throw new RuntimeException("无法生成不重复的题目，请清除历史记录");
+            }
+        } while (generatedQuestions.contains(question) || userHistoryQuestions.contains(question)); // 修改：同时检查历史题目
+
+        generatedQuestions.add(question);
+        return question;
+    }
+
+    private String generateSingleQuestion(DifficultyLevel level) {
+        int operandCount = random.nextInt(3) + 2; // 2-4个操作数
+        StringBuilder question = new StringBuilder();
+
+        switch (level) {
+            case PRIMARY:
+                question.append(generatePrimaryQuestion(operandCount));
+                break;
+            case JUNIOR:
+                question.append(generateJuniorQuestion(operandCount));
+                break;
+            case SENIOR:
+                question.append(generateSeniorQuestion(operandCount));
+                break;
+        }
+
+        return question.toString();
+    }
+
+    private String generatePrimaryQuestion(int operandCount) {
+        String[] operators = {"+", "-", "*", "/"};
+        return generateBasicQuestion(operandCount, operators, false);
+    }
+
+    private String generateJuniorQuestion(int operandCount) {
+        String question;
+        int attempt = 0;
+        do {
+            String[] operators = {"+", "-", "*", "/"};
+            question = generateBasicQuestion(operandCount, operators, true);
+
+            // 强制添加平方或开根号（修改点1）
+            question = addPowerOrRoot(question);
+            attempt++;
+        } while ((!question.contains("²") && !question.contains("√")) && attempt < 10);
+
+        return question;
+    }
+
+    private String generateSeniorQuestion(int operandCount) {
+        String question;
+        int attempt = 0;
+        do {
+            String[] operators = {"+", "-", "*", "/"};
+            question = generateBasicQuestion(operandCount, operators, true);
+
+            // 强制添加三角函数（修改点2）
+            question = addTrigonometricFunction(question);
+            attempt++;
+        } while ((!question.contains("sin") && !question.contains("cos") && !question.contains("tan")) && attempt < 10);
+
+        return question;
+    }
+
+    private String generateBasicQuestion(int operandCount, String[] operators, boolean useParentheses) {
+        if (operandCount < 2) {
+            // 单操作数时直接返回数字（修改点3）
+            return String.valueOf(getRandomNumber());
+        }
+
+        StringBuilder question = new StringBuilder();
+        int num = getRandomNumber();
+        question.append(num);
+
+        for (int i = 1; i < operandCount; i++) {
+            String operator = operators[random.nextInt(operators.length)];
+            num = getRandomNumber();
+
+            if (operator.equals("/")) {
+                num = Math.max(1, num);
+            }
+
+            boolean needParentheses = useParentheses &&
+                    (operator.equals("*") || operator.equals("/")) &&
+                    i < operandCount - 1;
+
+            if (needParentheses) {
+                question.insert(0, "(");
+                question.append(") ").append(operator).append(" ").append(num);
+            } else {
+                question.append(" ").append(operator).append(" ").append(num);
+            }
+        }
+
+        return question.toString();
+    }
+
+    private String addPowerOrRoot(String originalQuestion) {
+        // 修改点4：移除长度限制，支持单操作数
+        String[] parts = originalQuestion.split(" ");
+
+        // 如果是单操作数表达式
+        if (parts.length == 1) {
+            if (random.nextBoolean()) {
+                return parts[0] + "²";
+            } else {
+                return "√(" + parts[0] + ")";
+            }
+        }
+
+        // 多操作数表达式
+        int position = random.nextInt(parts.length);
+        while (position % 2 != 0) {
+            position = random.nextInt(parts.length);
+        }
+
+        if (random.nextBoolean()) {
+            parts[position] = parts[position] + "²";
+        } else {
+            parts[position] = "√(" + parts[position] + ")";
+        }
+
+        return String.join(" ", parts);
+    }
+
+    private String addTrigonometricFunction(String originalQuestion) {
+        // 修改点5：移除长度限制，支持单操作数
+        String[] parts = originalQuestion.split(" ");
+
+        // 如果是单操作数表达式
+        if (parts.length == 1) {
+            String[] trigFunctions = {"sin", "cos", "tan"};
+            String trigFunction = trigFunctions[random.nextInt(trigFunctions.length)];
+            return trigFunction + "(" + parts[0] + ")";
+        }
+
+        // 多操作数表达式
+        int position = random.nextInt(parts.length);
+        while (position % 2 != 0) {
+            position = random.nextInt(parts.length);
+        }
+
+        String[] trigFunctions = {"sin", "cos", "tan"};
+        String trigFunction = trigFunctions[random.nextInt(trigFunctions.length)];
+        parts[position] = trigFunction + "(" + parts[position] + ")";
+
+        return String.join(" ", parts);
+    }
+
+    private int getRandomNumber() {
+        return random.nextInt(100) + 1;
+    }
+
+    public void clearHistory() {
+        generatedQuestions.clear();
+    }
+}
\ No newline at end of file
diff --git a/src/QuestionPaper.java b/src/QuestionPaper.java
new file mode 100644
index 0000000..f9475ab
--- /dev/null
+++ b/src/QuestionPaper.java
@@ -0,0 +1,22 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class QuestionPaper {
+    private List<String> questions = new ArrayList<>();
+
+    public void addQuestion(String question) {
+        questions.add(question);
+    }
+
+    public List<String> getQuestions() {
+        return questions;
+    }
+
+    public String getFormattedPaper() {
+        StringBuilder paper = new StringBuilder();
+        for (int i = 0; i < questions.size(); i++) {
+            paper.append(i + 1).append(". ").append(questions.get(i)).append("\n\n");
+        }
+        return paper.toString();
+    }
+}
\ No newline at end of file
diff --git a/src/User.java b/src/User.java
new file mode 100644
index 0000000..e735188
--- /dev/null
+++ b/src/User.java
@@ -0,0 +1,20 @@
+public class User {
+    private String username;
+    private String password;
+    private DifficultyLevel level;
+
+    public User(String username, String password, DifficultyLevel level) {
+        this.username = username;
+        this.password = password;
+        this.level = level;
+    }
+
+    public String getUsername() { return username; }
+    public String getPassword() { return password; }
+    public DifficultyLevel getLevel() { return level; }
+    public void setLevel(DifficultyLevel level) { this.level = level; }
+
+    public boolean authenticate(String inputUsername, String inputPassword) {
+        return this.username.equals(inputUsername) && this.password.equals(inputPassword);
+    }
+}
\ No newline at end of file
diff --git a/src/untitled1.iml b/src/untitled1.iml
new file mode 100644
index 0000000..b107a2d
--- /dev/null
+++ b/src/untitled1.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/src/untitled1.jar b/src/untitled1.jar
new file mode 100644
index 0000000..544ef05
Binary files /dev/null and b/src/untitled1.jar differ