Abstract: Following the principle of concurrent engineering(CE),a prototype system of high level process planning(HLPP) was proposed.The complete design information of parts was taken as the data source of the HLPP.It is necessary to develop efficient pre-processors to acquire the design information and transform them into manufacturing data that can be used in process analysis.The pre-processor for extraction of design information,which was programmed with the developing package of UG(Unigraphics),extracts data from conceptual design models.The pre-processor of feature mapping transforms the design data into manufacturing data based on 3D feature recognition and mapping technique.The two pre-processors were integrated into a programming package as pre-process interfaces of HLPP.