本文根据我国机械制造业的现状，指出应大力开发和推广应用基于成组技术的派生武半创成式CAPP。论文对CAPP系统的实用性作了阐述，并以检索式、派生式和半创成式CAPP系统为基本组成部分，将一种特征技术运用于半创成CAPP，提出了一种强调派生式和这种半创成式相结合的实用CAPP系统模式。论文还简单地介绍了运用这一模式为宁波动力机厂开发的回转件CAPP系统NDCAPP。 According to the current situation of China’s machinery manufacturing industry, this paper points out that it is necessary to develop and popularize the derivative CAPP based on group technology. The paper elaborates the practicability of CAPP system, and uses the search, derived and semi-formed CAPP system as the basic part, applies a kind of characteristic technology to the semi-formed CAPP, puts forward a kind of emphasizing derived and This half-made into a combination of practical CAPP system model. The paper also briefly introduces the CAPP system NDCAPP developed by Ningbo Power Plant using this model.