分类知识的获取是数据挖掘要实现的重要任务之一，其核心问题是解决分类模型的构造和分类算法实现。本文以决策树分类方法中有代表性的方法C4．5为例，介绍数据挖掘中一种分类方法一决策树分类方法及其构建和应用研究。-Classification of knowledge acquisition is a data mining in order to achieve one of the important tasks, the core of the problem is classification model to solve the structure and classification algorithm. In this paper, decision tree classification method C4.5 has representation as an example, the introduction of data mining in a classification of one decision tree classification method and its building and applied research.