diff --git a/src/base_generator.py b/src/base_generator.py
new file mode 100644
index 0000000..1f4d4a7
--- /dev/null
+++ b/src/base_generator.py
@@ -0,0 +1,9 @@
+from abc import ABC, abstractmethod
+
+class BaseQuestionGenerator(ABC):
+    """抽象类：定义题目生成器接口"""
+
+    @abstractmethod
+    def generate_question(self):
+        """生成一条题目"""
+        pass
diff --git a/src/exam_generator.py b/src/exam_generator.py
new file mode 100644
index 0000000..2037e45
--- /dev/null
+++ b/src/exam_generator.py
@@ -0,0 +1,161 @@
+import os
+from history_manager import HistoryManager
+from junior_generator import JuniorQuestionGenerator
+from primary_generator import PrimaryQuestionGenerator
+from senior_generator import SeniorQuestionGenerator
+
+#查重功能在_generate_and_save_questions函数中实现
+
+class ExamGenerator:
+    def __init__(self):
+        self.accounts = {
+            "小学": [("张三1", "123"), ("张三2", "123"), ("张三3", "123")],
+            "初中": [("李四1", "123"), ("李四2", "123"), ("李四3", "123")],
+            "高中": [("王五1", "123"), ("王五2", "123"), ("王五3", "123")]
+        }
+        self.level = None
+        self.username = None
+        self.folder = None
+        self.history = set()
+        self.history_manager = HistoryManager()
+
+    def get_account_type(self, username, password):
+        """根据用户名和密码获取用户等级（角色）"""
+        for level, infos in self.accounts.items():
+            if (username, password) in infos:
+                return level
+        return None
+
+    def get_generator(self, level):
+        """根据等级获取对应的题目生成器"""
+        if level == "小学":
+            return PrimaryQuestionGenerator()
+        elif level == "初中":
+            return JuniorQuestionGenerator()
+        elif level == "高中":
+            return SeniorQuestionGenerator()
+        return None
+    
+    def run(self):
+        """
+        程序主入口，控制整体流程。
+        """
+        print("--- 欢迎使用数学题库生成系统 ---")
+        while True:
+            # 1. 处理登录
+            if not self._login():
+                print("感谢使用，再见！")
+                break # 退出整个程序
+
+            # 2. 登录成功后，进入主菜单循环
+            self._main_menu()
+
+            # 3. 从主菜单退出后，重置用户状态，准备下一次登录
+            self._reset_user_state()
+
+
+    def _login(self):
+        """
+        处理用户登录流程。
+        返回: 如果登录成功返回 True，如果用户选择退出返回 False。
+        """
+        while True:
+            login_input = input("请输入用户名和密码（以空格分隔），或输入 -1 退出：").strip()
+
+            if login_input == "-1":
+                return False
+
+            if " " not in login_input:
+                print("输入格式错误，请输入用户名和密码，以空格分隔。")
+                continue
+
+            username, password = login_input.split(" ", 1)
+            level = self.get_account_type(username, password)
+
+            if level:
+                self.username = username
+                self.level = level
+                self.folder = os.path.join("exams", self.username)
+                self.history = self.history_manager.load_history(self.folder)
+                print(f"\n登录成功！当前用户：{self.username}，当前等级：{self.level}")
+                return True
+            else:
+                print("用户名或密码错误，请重新输入。")
+
+
+    def _main_menu(self):
+        """
+        登录后的主菜单和命令处理循环。
+        """
+        while True:
+            # 根据当前等级获取生成器
+            generator = self.get_generator(self.level)
+            if not generator:
+                print("无法获取题目生成器，请联系管理员。")
+                break
+
+            cmd = input(f"\n请输入操作：\n"
+                        f"1. 直接输入数量 10-30(生成 {self.level} 数学题目)\n"
+                        f"2. 直接输入 '切换为小学/初中/高中'(切换等级)\n"
+                        f"3. 直接输入 -1(返回登录界面)\n"
+                        f"请输入您的选择：").strip()
+
+            if cmd == "-1":
+                print("\n正在退出当前用户...")
+                break # 退出主菜单循环
+
+            # 解析并执行命令
+            self._process_command(cmd, generator)
+
+
+    def _process_command(self, cmd, generator):
+        """
+        解析并执行用户在主菜单中输入的命令。
+        """
+        if cmd.startswith("切换为"):
+            new_level = cmd[3:].strip()
+            if new_level in ["小学", "初中", "高中"]:
+                self.level = new_level
+                print(f"系统提示：已成功切换为 {self.level} 等级。")
+            else:
+                print("切换失败，请输入 '切换为小学'、'切换为初中' 或 '切换为高中'。")
+
+        elif cmd.isdigit():
+            num = int(cmd)
+            if 10 <= num <= 30:
+                self._generate_and_save_questions(num, generator)
+            else:
+                print("无效数量，请输入 10 到 30 之间的数字。")
+
+        else:
+            print("无效的命令，请重新输入。")
+
+#查重功能
+    def _generate_and_save_questions(self, num, generator):
+        """
+        生成指定数量的不重复题目，并保存到文件和历史记录中。
+        """
+        print(f"正在为您生成 {num} 道 {self.level} 数学题目...")
+        questions = []
+        while len(questions) < num:
+            q = generator.generate_question()
+            # 确保题目既不在历史记录中，也不在本次生成的临时列表中
+            if q not in self.history and q not in questions:
+                questions.append(q)
+
+        # 保存题目
+        self.history_manager.save_questions(self.folder, questions)
+        # 更新内存中的历史记录
+        self.history.update(questions)
+        
+        print(f"✅ 成功生成并保存 {num} 道 {self.level} 数学题目！")
+
+
+    def _reset_user_state(self):
+        """
+        重置所有与当前用户相关的状态，以便下一个用户登录。
+        """
+        self.username = None
+        self.level = None
+        self.folder = None
+        self.history = set()
\ No newline at end of file
diff --git a/src/history_manager.py b/src/history_manager.py
new file mode 100644
index 0000000..6dc9daa
--- /dev/null
+++ b/src/history_manager.py
@@ -0,0 +1,22 @@
+import os
+from datetime import datetime
+
+class HistoryManager:
+    def load_history(self, folder):
+        history = set()
+        if not os.path.exists(folder):
+            os.makedirs(folder)
+            return history
+        for file in os.listdir(folder):
+            if file.endswith(".txt"):
+                with open(os.path.join(folder, file), "r", encoding="utf-8") as f:
+                    history.update(line.strip() for line in f if line.strip())
+        return history
+
+    def save_questions(self, folder, questions):
+        filename = datetime.now().strftime("%Y-%m-%d-%H-%M-%S.txt")
+        filepath = os.path.join(folder, filename)
+        with open(filepath, "w", encoding="utf-8") as f:
+            for i, q in enumerate(questions, 1):
+                f.write(f"{i}. {q}\n\n")
+        print(f"题目已保存到 {filepath}")
diff --git a/src/junior_generator.py b/src/junior_generator.py
new file mode 100644
index 0000000..ada8f77
--- /dev/null
+++ b/src/junior_generator.py
@@ -0,0 +1,26 @@
+import random
+from base_generator import BaseQuestionGenerator
+
+class JuniorQuestionGenerator(BaseQuestionGenerator):
+    def generate_question(self):
+        ops = ["+", "-", "*", "/"]
+        num_operands = random.randint(2, 5)
+        nums = [str(random.randint(1, 50)) for _ in range(num_operands)]
+
+        # 1. 初始化一个列表，将第一个数字作为初始元素
+        parts = [nums[0]]
+
+        # 2. 在循环中，将操作符和数字组成的子字符串追加到列表
+        for n in nums[1:]:
+            parts.append(" " + random.choice(ops) + " " + n)
+
+        # 3. 使用 "".join() 将列表中的所有部分一次性拼接成字符串
+        expr = "".join(parts)
+
+        # 后续逻辑保持不变
+        if random.choice([True, False]):
+            expr = f"({expr})^2"
+        else:
+            expr = f"√({expr})"
+            
+        return expr
\ No newline at end of file
diff --git a/src/main.py b/src/main.py
new file mode 100644
index 0000000..be3b276
--- /dev/null
+++ b/src/main.py
@@ -0,0 +1,5 @@
+from exam_generator import ExamGenerator
+
+if __name__ == "__main__":
+    generator = ExamGenerator()
+    generator.run()
diff --git a/src/primary_generator.py b/src/primary_generator.py
new file mode 100644
index 0000000..d72956a
--- /dev/null
+++ b/src/primary_generator.py
@@ -0,0 +1,23 @@
+import random
+from base_generator import BaseQuestionGenerator
+
+class PrimaryQuestionGenerator(BaseQuestionGenerator):
+    def generate_question(self):
+        ops = ["+", "-", "*"]
+        while True:
+            num_operands = random.randint(2, 4)  # 控制操作数数量
+            nums = [random.randint(1, 20) for _ in range(num_operands)]
+            chosen_ops = [random.choice(ops) for _ in range(num_operands - 1)]
+
+            # 构造表达式字符串
+            expr = str(nums[0])
+            for i in range(1, num_operands):
+                expr += f" {chosen_ops[i-1]} {nums[i]}"
+
+            try:
+                result = eval(expr)
+            except ZeroDivisionError:
+                continue  # 避免除零错误
+
+            if result > 0 and isinstance(result, int):
+                return expr
diff --git a/src/senior_generator.py b/src/senior_generator.py
new file mode 100644
index 0000000..69630ae
--- /dev/null
+++ b/src/senior_generator.py
@@ -0,0 +1,15 @@
+import random
+from base_generator import BaseQuestionGenerator
+
+class SeniorQuestionGenerator(BaseQuestionGenerator):
+    def generate_question(self):
+        ops = ["+", "-", "*", "/"]
+        num_operands = random.randint(2, 5)
+        nums = [str(random.randint(1, 100)) for _ in range(num_operands)]
+
+        func = random.choice(["sin", "cos", "tan"])
+        expr = nums[0]
+        for n in nums[1:]:
+            expr += " " + random.choice(ops) + " " + n
+
+        return f"{func}({expr})"