Abstract: A new KSP (Knowledge Service Provider)-based collaboration model for CAPP in networked manufacturing environment is proposed. Built on web services on the Semantic Web, a semantic architecture is presented to describe capabilities of knowledge services for CAPP. According to the concept of work flow, a new technology of knowledge service flow for CAPP is explored to realize automatic management of service processes in this model. Finally, a method of service matching is discussed and its algorithm is provided. This model has produced satisfactory effects in practice.