The accurate 3D geometric model of spiral bevel gear is the basis of virtual assembly,contact performance analysis and precision testing.Because the tooth surface of the spiral bevel gear is a complex curved surface,the shape and structure are more complicated,and todays tooth surface forming technology is not mature enough,so the tooth surface cannot be accurately formed.In order to improve the accuracy of tooth surface forming,a fast and accurate tooth surface forming method was studied.The principle of gear meshing was used as the theoretical basis,MATLAB was used as the main calculation tool,the 3D coordinates of the tooth points were accurately output;3D modeling software SolidWorks was used for 3D modeling.The results show that by using this method,the accuracy of gear tooth surface can be improved.