Abstract: Factors leading to the existence of multi-process schemes and influencing factors were analyzed, in particular the sequencing of parts and features, diversity of processing methods, dynamic characters of manufacturing resources, and complexity of processing design principles, and many others. A step-up network layer structure is proposed that expresses the features of processing of parts and the manufacturing resources. For their estimation a process scheme sorting layer tree is set up. The fuzzy synthetic estimation module is founded based on the product quality, manufacturing cost and production cycle. It has been adopted to cases in production and has realized the optimization of process schemes in CAPP.