diff --git a/src/AccountManager.class b/src/AccountManager.class
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diff --git a/src/AccountManager.java b/src/AccountManager.java
new file mode 100644
index 0000000..cb26a91
--- /dev/null
+++ b/src/AccountManager.java
@@ -0,0 +1,40 @@
+import java.util.HashMap;
+import java.util.Map;
+
+
+public class AccountManager {
+    private Map<String, User> users;
+    
+    public AccountManager() {
+        initializeUsers();
+    }
+    
+    private void initializeUsers() {
+        users = new HashMap<>();
+        
+        addUser("张三1", "123", UserType.PRIMARY);
+        addUser("张三2", "123", UserType.PRIMARY);
+        addUser("张三3", "123", UserType.PRIMARY);
+        
+        addUser("李四1", "123", UserType.JUNIOR);
+        addUser("李四2", "123", UserType.JUNIOR);
+        addUser("李四3", "123", UserType.JUNIOR);
+        
+        addUser("王五1", "123", UserType.SENIOR);
+        addUser("王五2", "123", UserType.SENIOR);
+        addUser("王五3", "123", UserType.SENIOR);
+    }
+    
+    private void addUser(String username, String password, UserType type) {
+        users.put(username + ":" + password, new User(username, password, type));
+    }
+    
+    public User authenticate(String username, String password) {
+        String key = username + ":" + password;
+        return users.get(key);
+    }
+    
+    public boolean isValidUserType(String typeName) {
+        return UserType.fromChineseName(typeName) != null;
+    }
+}
\ No newline at end of file
diff --git a/src/Filemanager.class b/src/Filemanager.class
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diff --git a/src/Filemanager.java b/src/Filemanager.java
new file mode 100644
index 0000000..c1e0461
--- /dev/null
+++ b/src/Filemanager.java
@@ -0,0 +1,91 @@
+import java.io.*;
+import java.nio.file.*;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+
+
+public class Filemanager {
+    private static final String BASE_DIR = "数学试卷";
+    
+    public Filemanager() {
+        createBaseDirectory();
+    }
+    
+    private void createBaseDirectory() {
+        File baseDir = new File(BASE_DIR);
+        if (!baseDir.exists()) {
+            baseDir.mkdir();
+        }
+    }
+    
+    public void savePaper(String username, String[] questions) throws IOException {
+        String userDirPath = BASE_DIR + File.separator + username;
+        File userDir = new File(userDirPath);
+        if (!userDir.exists()) {
+            userDir.mkdir();
+        }
+        
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
+        String fileName = timestamp + ".txt";
+        String filePath = userDirPath + File.separator + fileName;
+        
+        try (PrintWriter writer = new PrintWriter(new FileWriter(filePath))) {
+            for (int i = 0; i < questions.length; i++) {
+                writer.println(questions[i]);
+                if (i < questions.length - 1) {
+                    writer.println(); 
+                }
+            }
+        }
+        
+        System.out.println("试卷已保存到: " + new File(filePath).getAbsolutePath());
+    }
+    
+    public Set<String> loadAllQuestions(String username) {
+        Set<String> allQuestions = new HashSet<>();
+        String userDirPath = BASE_DIR + File.separator + username;
+        File userDir = new File(userDirPath);
+        
+        if (!userDir.exists() || !userDir.isDirectory()) {
+            return allQuestions;
+        }
+        
+        File[] files = userDir.listFiles((dir, name) -> name.endsWith(".txt"));
+        if (files == null) {
+            return allQuestions;
+        }
+        
+        for (File file : files) {
+            try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
+                String line;
+                StringBuilder question = new StringBuilder();
+                boolean inQuestion = false;
+                
+                while ((line = reader.readLine()) != null) {
+                    if (line.matches("^\\d+\\.\\s.*")) {
+                        if (inQuestion) {
+                            allQuestions.add(question.toString().trim());
+                            question.setLength(0);
+                        }
+                        String questionContent = line.substring(line.indexOf(". ") + 2);
+                        question.append(questionContent);
+                        inQuestion = true;
+                    } else if (inQuestion && !line.trim().isEmpty()) {
+                        question.append(" ").append(line.trim());
+                    }
+                }
+                
+                if (inQuestion && question.length() > 0) {
+                    allQuestions.add(question.toString().trim());
+                }
+                
+            } catch (IOException e) {
+                System.err.println("读取文件失败: " + file.getName());
+            }
+        }
+        
+        return allQuestions;
+    }
+}
\ No newline at end of file
diff --git a/src/IQuestionGenerator.class b/src/IQuestionGenerator.class
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index 0000000..84dabe7
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diff --git a/src/JuniorQuestionGenerator.class b/src/JuniorQuestionGenerator.class
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diff --git a/src/Main.class b/src/Main.class
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diff --git a/src/Main.java b/src/Main.java
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--- /dev/null
+++ b/src/Main.java
@@ -0,0 +1,124 @@
+import java.util.Scanner;
+
+
+public class Main {
+    private AccountManager accountManager;
+    private PaperGenerator paperGenerator;
+    private Filemanager fileManager;
+    private User currentUser;
+    private Scanner scanner;
+    
+    public Main() {
+        this.accountManager = new AccountManager();
+        this.fileManager = new Filemanager();
+        this.scanner = new Scanner(System.in);
+    }
+    
+    public void run() {
+        System.out.println("=== 中小学数学卷子自动生成程序 ===");
+        
+        while (true) {
+            if (currentUser == null) {
+                login();
+            } else {
+                generatePaperProcess();
+            }
+        }
+    }
+    
+    private void login() {
+        while (true) {
+            System.out.print("请输入用户名和密码（用空格隔开）: ");
+            String input = scanner.nextLine().trim();
+            
+            if (input.equalsIgnoreCase("exit")) {
+                System.exit(0);
+            }
+            
+            String[] parts = input.split("\\s+");
+            if (parts.length != 2) {
+                System.out.println("请输入正确的用户名、密码格式（用户名 密码）");
+                continue;
+            }
+            
+            String username = parts[0];
+            String password = parts[1];
+            
+            currentUser = accountManager.authenticate(username, password);
+            if (currentUser != null) {
+                paperGenerator = new PaperGenerator(currentUser);
+                System.out.println("当前选择为 " + currentUser.getUserType().getChineseName() + " 出题");
+                break;
+            } else {
+                System.out.println("请输入正确的用户名、密码");
+            }
+        }
+    }
+    
+    private void generatePaperProcess() {
+        UserType currentType = currentUser.getUserType();
+        
+        while (true) {
+            System.out.print("准备生成 " + currentType.getChineseName() + 
+                           " 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）: ");
+            String input = scanner.nextLine().trim();
+            
+            if (input.equals("-1")) {
+                currentUser = null;
+                paperGenerator = null;
+                System.out.println("已退出当前用户，请重新登录。");
+                return;
+            }
+            
+            if (input.startsWith("切换为")) {
+                handleTypeSwitch(input);
+                currentType = currentUser.getUserType();
+                continue;
+            }
+            
+            try {
+                int questionCount = Integer.parseInt(input);
+                
+                if (questionCount < 10 || questionCount > 30) {
+                    System.out.println("题目数量必须在10-30之间");
+                    continue;
+                }
+                
+                String[] questions = paperGenerator.generatePaper(questionCount, fileManager);
+                fileManager.savePaper(currentUser.getUsername(), questions);
+                
+            } catch (NumberFormatException e) {
+                System.out.println("请输入有效的数字（10-30或-1）");
+            } catch (Exception e) {
+                System.out.println("生成试卷时出错: " + e.getMessage());
+            }
+        }
+    }
+    
+    private void handleTypeSwitch(String input) {
+        String typeName = input.substring(3).trim();
+        
+        if (!accountManager.isValidUserType(typeName)) {
+            System.out.println("请输入小学、初中和高中三个选项中的一个");
+            return;
+        }
+        
+        UserType newType = UserType.fromChineseName(typeName);
+        paperGenerator.setUserType(newType);
+        
+        User tempUser = new User(currentUser.getUsername(), currentUser.getPassword(), newType);
+        currentUser = tempUser;
+        
+        System.out.println("已切换为 " + typeName + " 出题");
+    }
+    
+    public static void main(String[] args) {
+        try {
+            Main app = new Main();
+            app.run();
+        } catch (Exception e) {
+            System.err.println("程序出现异常: " + e.getMessage());
+            e.printStackTrace();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/PaperGenerator.class b/src/PaperGenerator.class
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diff --git a/src/PaperGenerator.java b/src/PaperGenerator.java
new file mode 100644
index 0000000..604c6da
--- /dev/null
+++ b/src/PaperGenerator.java
@@ -0,0 +1,48 @@
+import java.util.HashSet;
+import java.util.Set;
+
+
+public class PaperGenerator {
+    private IQuestionGenerator questionGenerator;
+    private Set<String> generatedQuestions;
+    private User currentUser;
+    
+    public PaperGenerator(User user) {
+        this.currentUser = user;
+        this.questionGenerator = QuestionGeneratorFactory.createGenerator(user.getUserType());
+        this.generatedQuestions = new HashSet<>();
+    }
+    
+    public void setUserType(UserType userType) {
+        this.questionGenerator = QuestionGeneratorFactory.createGenerator(userType);
+    }
+    
+    public String[] generatePaper(int questionCount, Filemanager fileManager) {
+        if (questionCount < 10 || questionCount > 30) {
+            throw new IllegalArgumentException("题目数量必须在10-30之间");
+        }
+        
+        String[] questions = new String[questionCount];
+        Set<String> allHistoryQuestions = fileManager.loadAllQuestions(currentUser.getUsername());
+        generatedQuestions.addAll(allHistoryQuestions);
+        
+        for (int i = 0; i < questionCount; i++) {
+            String question;
+            int attempt = 0;
+            int maxAttempts = 100; 
+            
+            do {
+                question = questionGenerator.generateQuestion();
+                attempt++;
+                if (attempt >= maxAttempts) {
+                    throw new RuntimeException("无法生成不重复的题目，请尝试清理历史文件");
+                }
+            } while (generatedQuestions.contains(question) || !questionGenerator.isValidQuestion(question));
+            
+            generatedQuestions.add(question);
+            questions[i] = (i + 1) + ". " + question;
+        }
+        
+        return questions;
+    }
+}
\ No newline at end of file
diff --git a/src/PrimaryQuestionGenerator.class b/src/PrimaryQuestionGenerator.class
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diff --git a/src/QuestionGenerator.java b/src/QuestionGenerator.java
new file mode 100644
index 0000000..b24762d
--- /dev/null
+++ b/src/QuestionGenerator.java
@@ -0,0 +1,185 @@
+import java.util.Random;
+
+
+interface IQuestionGenerator {
+    String generateQuestion();
+    boolean isValidQuestion(String question);
+}
+
+
+class PrimaryQuestionGenerator implements IQuestionGenerator {
+    private Random random = new Random();
+    private String[] operators = {"+", "-", "*", "/"};
+    
+    @Override
+    public String generateQuestion() {
+        int operandCount = random.nextInt(3) + 2; 
+        StringBuilder question = new StringBuilder();
+        
+        question.append(random.nextInt(100) + 1);
+        
+        for (int i = 1; i < operandCount; i++) {
+            String operator = operators[random.nextInt(operators.length)];
+            int operand = random.nextInt(100) + 1;
+            
+            if (random.nextBoolean() && i < operandCount - 1) {
+                question.append(" ").append(operator).append(" (").append(operand);
+                if (random.nextBoolean()) {
+                    question.append(" ").append(operators[random.nextInt(operators.length)])
+                           .append(" ").append(random.nextInt(100) + 1).append(")");
+                    i++;
+                }
+            } else {
+                question.append(" ").append(operator).append(" ").append(operand);
+            }
+        }
+        
+        String result = question.toString();
+        int openCount = countChar(result, '(');
+        int closeCount = countChar(result, ')');
+        while (openCount > closeCount) {
+            result += ")";
+            closeCount++;
+        }
+        
+        return result + " = ";
+    }
+    
+    @Override
+    public boolean isValidQuestion(String question) {
+        return question.matches("^[0-9+\\-*/().\\s]+=$") && 
+               !question.contains("²") && !question.contains("√") &&
+               !question.contains("sin") && !question.contains("cos") && !question.contains("tan");
+    }
+    
+    private int countChar(String str, char ch) {
+        int count = 0;
+        for (char c : str.toCharArray()) {
+            if (c == ch) count++;
+        }
+        return count;
+    }
+}
+
+
+class JuniorQuestionGenerator implements IQuestionGenerator {
+    private Random random = new Random();
+    private String[] operators = {"+", "-", "*", "/"};
+    
+    @Override
+    public String generateQuestion() {
+        StringBuilder question = new StringBuilder();
+        int operandCount = random.nextInt(3) + 2; 
+        boolean hasSpecialOperator = false;
+        
+        question.append(random.nextInt(100) + 1);
+        
+        for (int i = 1; i < operandCount; i++) {
+            String operator;
+            if (!hasSpecialOperator && random.nextDouble() < 0.4) {
+                if (random.nextBoolean()) {
+                    operator = "²";
+                    hasSpecialOperator = true;
+                } else {
+                    operator = "√";
+                    hasSpecialOperator = true;
+                }
+            } else {
+                operator = operators[random.nextInt(operators.length)];
+            }
+            
+            int operand = random.nextInt(100) + 1;
+            
+            if (operator.equals("²")) {
+                question.append("²");
+            } else if (operator.equals("√")) {
+                question.append(" ").append(operator).append(operand);
+            } else {
+                question.append(" ").append(operator).append(" ").append(operand);
+            }
+        }
+        
+        if (!hasSpecialOperator) {
+            if (random.nextBoolean()) {
+                question.append("²");
+            } else {
+                question.append(" √").append(random.nextInt(100) + 1);
+            }
+        }
+        
+        return question.toString() + " = ";
+    }
+    
+    @Override
+    public boolean isValidQuestion(String question) {
+        return (question.contains("²") || question.contains("√")) &&
+               !question.contains("sin") && !question.contains("cos") && !question.contains("tan");
+    }
+}
+
+
+class SeniorQuestionGenerator implements IQuestionGenerator {
+    private Random random = new Random();
+    private String[] operators = {"+", "-", "*", "/"};
+    private String[] trigFunctions = {"sin", "cos", "tan"};
+    
+    @Override
+    public String generateQuestion() {
+        StringBuilder question = new StringBuilder();
+        int operandCount = random.nextInt(3) + 2; 
+        boolean hasTrigFunction = false;
+        
+        if (random.nextDouble() < 0.6) {
+            String trigFunc = trigFunctions[random.nextInt(trigFunctions.length)];
+            int angle = random.nextInt(360) + 1;
+            question.append(trigFunc).append("(").append(angle).append("°)");
+            hasTrigFunction = true;
+        } else {
+            question.append(random.nextInt(100) + 1);
+        }
+        
+        for (int i = 1; i < operandCount; i++) {
+            String operator = operators[random.nextInt(operators.length)];
+            
+            if (!hasTrigFunction && random.nextDouble() < 0.5) {
+                String trigFunc = trigFunctions[random.nextInt(trigFunctions.length)];
+                int angle = random.nextInt(360) + 1;
+                question.append(" ").append(operator).append(" ").append(trigFunc).append("(").append(angle).append("°)");
+                hasTrigFunction = true;
+            } else {
+                int operand = random.nextInt(100) + 1;
+                question.append(" ").append(operator).append(" ").append(operand);
+            }
+        }
+        
+        if (!hasTrigFunction) {
+            String trigFunc = trigFunctions[random.nextInt(trigFunctions.length)];
+            int angle = random.nextInt(360) + 1;
+            question.append(" ").append(operators[random.nextInt(operators.length)])
+                   .append(" ").append(trigFunc).append("(").append(angle).append("°)");
+        }
+        
+        return question.toString() + " = ";
+    }
+    
+    @Override
+    public boolean isValidQuestion(String question) {
+        return question.contains("sin") || question.contains("cos") || question.contains("tan");
+    }
+}
+
+
+class QuestionGeneratorFactory {
+    public static IQuestionGenerator 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");
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/QuestionGeneratorFactory$1.class b/src/QuestionGeneratorFactory$1.class
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diff --git a/src/SeniorQuestionGenerator.class b/src/SeniorQuestionGenerator.class
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diff --git a/src/User.class b/src/User.class
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index 0000000..aa0783d
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diff --git a/src/User.java b/src/User.java
new file mode 100644
index 0000000..a4df58d
--- /dev/null
+++ b/src/User.java
@@ -0,0 +1,55 @@
+
+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;
+    }
+    
+    public String getUsername() { return username; }
+    public String getPassword() { return password; }
+    public UserType getUserType() { return userType; }
+    
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
+        User user = (User) obj;
+        return username.equals(user.username) && password.equals(user.password);
+    }
+    
+    @Override
+    public int hashCode() {
+        return username.hashCode() + password.hashCode();
+    }
+}
+
+
+enum UserType {
+    PRIMARY("小学"),
+    JUNIOR("初中"),
+    SENIOR("高中");
+    
+    private final String chineseName;
+    
+    UserType(String chineseName) {
+        this.chineseName = chineseName;
+    }
+    
+    public String getChineseName() {
+        return chineseName;
+    }
+    
+    public static UserType fromChineseName(String name) {
+        for (UserType type : values()) {
+            if (type.chineseName.equals(name)) {
+                return type;
+            }
+        }
+        return null;
+    }
+}
\ No newline at end of file
diff --git a/src/UserType.class b/src/UserType.class
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