Objective, in order to better design the mechanical product shape, improve the satisfaction of users, and improve the efficiency of scheme design. Methods, this paper presents a comprehensive design method based on genetic algorithm to design the modeling of mechanical products. First complete the product positioning; The mapping relationship between user requirements and actual parameters is established based on aesthetic principles, and the evaluation model is established. Using genetic algorithm to seek the optimal solution of evaluation model, based on Visual Basic language to optimize the data in SOLIDWORKS quickly generate 3D model. In conclusion, this paper quantifies user requirements through aesthetic principles, and quickly completes the modeling process based on secondary development, which provides a new comprehensive design method for modeling design.