Taking the five axis NAS cone test piece as the research object, the five axis postprocessing file was generated by using CATIA software. The G code simulation verification was carried out by using VERICUT software, and the cutting correctness was verified by the CATIA postprocessing on GS200 Huazhong NC fiveaxis machine tool with AC double turntable structure. The correctness of the postprocessing development for the Huazhong fiveaxis machine tool based on CATIA is verified.