Utilize the coordinate transformation method to establish the surface equation for gear tooth. Techniques such as feature modeling, parametric driving, two-dimensional and three-dimensional full dynamical correlation are also used to process the tooth surface and add features according to the relationship between individual features and creating order. A number of rotation and duplication is also utilized to obtain all the cogging, finally completing the detail design for each feature. This method has avoided the shortcomings of traditional three-dimensional dynamic assembly and excessive motion simulation computing, greatly improved the operational efficiency, reduced the size of storage file and decreased requirements for computer hardware.