学生管理系统分三个模块：管理员，教师，学生。管理员有增、删、查、改的功能；教师有改学生成绩功能，学生有查看自己信息的功能-Student management system is divided into three modules: Administrators, teachers and students. Administrators have to add, delete, search, change of function　teachers have to change the function of student achievement, students have their own viewing information