diff --git a/doc/README.md b/doc/README.md
new file mode 100644
index 0000000..01062e8
--- /dev/null
+++ b/doc/README.md
@@ -0,0 +1 @@
+#个人项目：中小学数学卷子自动生成程序
diff --git a/src/ExamSystem.java b/src/ExamSystem.java
new file mode 100644
index 0000000..319b429
--- /dev/null
+++ b/src/ExamSystem.java
@@ -0,0 +1,59 @@
+import java.util.Scanner;
+
+public class ExamSystem {
+  private final Scanner scanner = new Scanner(System.in);
+  public Users login() {
+    Users users = null;
+    while (users == null) {
+      System.out.print("请输入用户名和密码: ");
+      String input = scanner.nextLine();
+      String[] parts = input.split(" ");
+      if (parts.length == 2) {
+        users = Users.login(parts[0], parts[1]);
+      }
+      if (users == null) {
+        System.out.println("请输入正确的用户名、密码");
+      }
+    }
+    System.out.println("当前选择为" + users.getType() + "出题");
+    return users;
+  }
+  
+  public void generateProblems(Users users) {
+    while (true) {
+      
+      System.out.print("准备生成" + users.getType()
+          + "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")) {
+        break;
+      }
+      
+      ProblemsGenerator generator = switch (users.getType()) {
+        case "小学" -> new PrimaryProblem();
+        case "初中" -> new JuniorProblem();
+        case "高中" -> new SeniorProblem();
+        default -> null;
+      };
+      
+      if (input.startsWith("切换为")) {
+        String target = input.replace("切换为", "");
+        if (target.equals("小学") || target.equals("初中") || target.equals("高中")) {
+          users = new Users(users.getName(), users.getPassword(), target);
+          System.out.println("系统提示：准备生成" + users.getType() + "数学题目");
+        } else {
+          System.out.println("请输入小学、初中和高中三个选项中的一个");
+        }
+        continue;
+      }
+      
+      int num = Integer.parseInt(input);
+      if (num >= 10 && num <= 30 && generator != null) {
+        Generator.generate(users, num, generator);
+      } else {
+        System.out.println("请输入 10-30 之间的数字");
+      }
+    }
+  }
+}
diff --git a/src/Generator.java b/src/Generator.java
new file mode 100644
index 0000000..200797f
--- /dev/null
+++ b/src/Generator.java
@@ -0,0 +1,34 @@
+import java.io.FileWriter;
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class Generator {
+  public static void generate(Users users, int count, ProblemsGenerator problemsGenerator) {
+    StringBuilder builder = new StringBuilder();
+    for (int i = 1; i <= count; i++) {
+      builder.append(i).append(". ").append(problemsGenerator.generate()).append("\n\n");
+    }
+    save(users, builder.toString());
+    System.out.println("题目生成完成。");
+  }
+  
+  private static void save(Users users, String content) {
+    try {
+      String folder = "doc/" + users.getType();
+      java.io.File dir = new java.io.File(folder);
+      if (!dir.exists()) {
+        dir.mkdirs();
+      }
+      String filename = LocalDateTime.now()
+          .format(DateTimeFormatter.ofPattern("yyyy-MM-dd-HH-mm-ss")) + ".txt";
+      FileWriter writer = new FileWriter(folder + "/" + filename);
+      writer.write(content);
+      writer.close();
+    } catch (IOException e) {
+      System.out.println("保存失败：" + e.getMessage());
+    }
+  }
+}
+
+
diff --git a/src/JuniorProblem.java b/src/JuniorProblem.java
new file mode 100644
index 0000000..8933d87
--- /dev/null
+++ b/src/JuniorProblem.java
@@ -0,0 +1,23 @@
+import java.util.Random;
+
+public class JuniorProblem implements ProblemsGenerator{
+  private static final Random RANDOM = new Random();
+  
+  @Override
+  public String generate() {
+    int count = RANDOM.nextInt(5) + 1; // 1~5个数
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < count; i++) {
+      int num = RANDOM.nextInt(20) + 1;
+      if (RANDOM.nextBoolean()) {
+        sb.append(num).append("^2");
+      } else {
+        sb.append("√").append(num);
+      }
+      if (i < count - 1) {
+        sb.append(" + ");
+      }
+    }
+    return sb.toString();
+  }
+}
\ No newline at end of file
diff --git a/src/Main.java b/src/Main.java
new file mode 100644
index 0000000..374dc2d
--- /dev/null
+++ b/src/Main.java
@@ -0,0 +1,9 @@
+public class Main {
+  public static void main(String[] args) {
+    ExamSystem system = new ExamSystem();
+    while (true) {
+      Users users = system.login();
+      system.generateProblems(users);
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/PrimaryProblem.java b/src/PrimaryProblem.java
new file mode 100644
index 0000000..4b5e693
--- /dev/null
+++ b/src/PrimaryProblem.java
@@ -0,0 +1,20 @@
+import java.util.Random;
+
+public class PrimaryProblem implements ProblemsGenerator {
+  private static final Random RANDOM = new Random();
+  private static final char[] OPS = {'+', '-', '*', '/'};
+  
+  @Override
+  public String generate() {
+    int count = RANDOM.nextInt(5) + 1; // 1~5个数
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < count; i++) {
+      int num = RANDOM.nextInt(100) + 1;
+      sb.append(num);
+      if (i < count - 1) {
+        sb.append(" ").append(OPS[RANDOM.nextInt(OPS.length)]).append(" ");
+      }
+    }
+    return sb.toString();
+  }
+}
\ No newline at end of file
diff --git a/src/ProblemsGenerator.java b/src/ProblemsGenerator.java
new file mode 100644
index 0000000..94b8bee
--- /dev/null
+++ b/src/ProblemsGenerator.java
@@ -0,0 +1,3 @@
+public interface ProblemsGenerator {
+  String generate();
+}
diff --git a/src/SeniorProblem.java b/src/SeniorProblem.java
new file mode 100644
index 0000000..a5675bf
--- /dev/null
+++ b/src/SeniorProblem.java
@@ -0,0 +1,21 @@
+import java.util.Random;
+
+public class SeniorProblem implements ProblemsGenerator{
+  private static final Random RANDOM = new Random();
+  private static final String[] FUNCS = {"sin", "cos", "tan"};
+  
+  @Override
+  public String generate() {
+    int count = RANDOM.nextInt(5) + 1; // 1~5个数
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < count; i++) {
+      int angle = RANDOM.nextInt(90) + 1;
+      String func = FUNCS[RANDOM.nextInt(FUNCS.length)];
+      sb.append(func).append("(").append(angle).append("°)");
+      if (i < count - 1) {
+        sb.append(" + ");
+      }
+    }
+    return sb.toString();
+  }
+}
\ No newline at end of file
diff --git a/src/Users.java b/src/Users.java
new file mode 100644
index 0000000..b77898d
--- /dev/null
+++ b/src/Users.java
@@ -0,0 +1,44 @@
+public class Users {
+  private final String name;
+  private final String password;
+  private final String type;
+  
+  private static final Users[] USERS = {
+      new Users("张三1", "123", "小学"),
+      new Users("张三2", "123", "小学"),
+      new Users("张三3", "123", "小学"),
+      new Users("李四1", "123", "初中"),
+      new Users("李四2", "123", "初中"),
+      new Users("李四3", "123", "初中"),
+      new Users("王五1", "123", "高中"),
+      new Users("王五2", "123", "高中"),
+      new Users("王五3", "123", "高中")
+  };
+  
+  public Users(String name, String password, String type) {
+    this.name = name;
+    this.password = password;
+    this.type = type;
+  }
+  
+  public String getType() {
+    return type;
+  }
+  
+  public String getName() {
+    return name;
+  }
+  
+  public String getPassword() {
+    return password;
+  }
+  
+  public static Users login(String name, String password) {
+    for (Users users : USERS) {
+      if (users.getName().equals(name) && users.getPassword().equals(password)) {
+        return users;
+      }
+    }
+    return null;
+  }
+}
\ No newline at end of file