Abstract: According to systematic principle, the machine parts were classified by their geometrical figure or processing comparability, and the databases of technical schedule and standard were established. Parts' code were also saved in system database and data file. When a new machining schedule was compiled, the new parts to be processed were coded and compared with major parts retrieved from the database, and the data was edited and modified in the CAPP system, the new machining schedule was finished. The CAPP system could connect with MPRⅡ data system and CAD/CAM system.