Abstract: In actual processing，three axis processing center are usually used to process spare parts which have surfaces within single coordinate，while five axis processing center are used to produce spare parts containing continuous complex curved surfaces. With the existing equipments，taking a certain car model as example，explores the processing technics of three axis processing center for continuous complex curved surfaces. The solution extends the working range of three axis equipment.Presents the resolving thoughts for problems in the processing.

Key words: three axis numerical control processing, hexahedral processing︱numerical control processing technics, locating datum