本文从基于数据库的知识发现开始，较系统全面地介绍了KDD、数据挖掘都基本概念，并研究了数据挖掘所采用都技术方法和应用领域：在现有研究工作的基础上，提出用连续量代替离散量来表示客体的思想，同时采用积分面积来表示两个客体之间都距离，并对客体进行分类。利用上述方法对学生都数据进行挖掘，得到了一些有用的结论，从而指导学校都教学工作。-Based on the knowledge discovety in database this paper presents a introduction of KDD,an concept of data mining and a research into the technical approach and fields of application of data mining.Based on the present research work,this paper is devoted to the idea of presenting the segregation amount by using the whole amount.Integral square is adopted to indicated the distance between two units.And the above-stated method is used to analyze the students data.And some useful information is thus obtained.So it is instructive to teaching at colleges.