CB-MG, MAP2.5, MAP3.5, MDP2.5, MHP3 series gear pumps are mainly used in petroleum machinery. Based on the role and performance requirements of polymer gear pumps in petrochemical production, the principle of gear meshing is used to derive Close the tooth profile equation of the tooth profile meshing profile, complete the corresponding numerical calculation program of the tooth profile, and study the 3D solid modeling and gear assembly motion simulation of the gear rotor; use the 3D modeling of the gear to perform assembly simulation and analyze the meshing assembly assembly Interference and backlash can determine the correctness of the gear profile before machining.