Mould cases are investigated, and rules of features information describing and abstracting are proposed, and also, a layer model to represent the case of injection mould is built.

• 实例库是CBR技术应用的重要前提,在对几百个注射模实例进行分析的基础上,提出了表达注射模实例的特征信息以及特征信息的提取方法,并引入了注射模实例的层次化描述方法;