This paper makes a deep study in KDD, CBR and these problems as follows:1. Gives an overview of the building and maintenance of the case base, introduces the aim, the process, the main methods of KDC and a CBR system based on KDD.

• 综述了范例库的建立和维护知识,范例库上的知识发现的目标、步骤、主要方法以及基于知识发现技术的CBR系统等相关内容。