diff --git a/app.py b/app.py
index 94ef79d..ab0290c 100644
--- a/app.py
+++ b/app.py
@@ -198,29 +198,6 @@ def get_db_connection():
         return None
 
 
-def generate_captcha():
-    # 生成6位随机验证码
-    captcha_code = ''.join(random.choices(string.ascii_uppercase + string.digits, k=6))
-    conn = get_db_connection()
-    if conn:
-        try:
-            cursor = conn.cursor()
-            # 清除旧的验证码
-            cursor.execute("DELETE FROM captcha WHERE created_at < NOW() - INTERVAL 10 MINUTE")
-            # 插入新验证码
-            cursor.execute("INSERT INTO captcha (code) VALUES (%s)", (captcha_code,))
-            conn.commit()
-            return captcha_code
-        except Error as e:
-            print(f"Database error: {e}")
-            return None
-        finally:
-            if conn.is_connected():
-                cursor.close()
-                conn.close()
-    return None
-
-
 def verify_captcha(user_input):
     """验证用户输入的验证码是否正确（只验证最新的4位验证码）"""
     conn = get_db_connection()