In order to solve the difficult problem of gear modeling of circular arc tooth profile, an efficient and accurate modeling method was put forward. Taking generating principle as the theoretical basis, Boolean operation as the main method, the accurate model was established. Then secondary development technology of CATIA software was used to white VBA macro program to complete the motion of the cutter gear enveloping process to cut surface of the gear blank, creating a circular face gear tooth surface.The method was similar to the gear shaping face gear. The difference was that the cutter only makes the envelope forming movement of revolution and rotation, and the formed tooth surface was controllable and reliable.The tool trace is reproduced on the theoretical model, which provides a model reference for the processing and research of the gear with circular arc profile.