Abstract:The machining technology and UG NX impeller machining special module were studied. On the basis of post processing technology, special post processing files for double turntable processing center (MCV8505) were created, and the correctness and practicability of the customized postprocessing files were verified in the MCV8505 five axis machining center. Practice has proved that in the actual processing UG NX impeller special modules and the customized post processing file can improve the machining precision of the impeller, and shorten the processing time.So the seamless docking between CAD/CAM software and actual manufacturing equipment is truly realized,it has good practical value.