This paper introduces classification data mining technology and analyzes student loss in student retention project. Further, decision tree model is applied to the mining system in student resources warehouse and get effective results. 在此篇文章中我们简述了分类挖掘技术并分析了学生保持工程中的学生流失问题,在此基础上,我们将决策树分类模型运用到学生资源数据仓库的挖掘系统中,并取得了较好的效果。