The visual characteristics of high-speed trains in China are comparatively not at an advantage, while vehicle serialization and product identification remains to be a major problem. From the perspective of design geometry, This paper analyzes the mathematical composition of modeling curves in foreign excellent models, summarizes the geometric proportional relationship of the vehicle system, innovates a design and operation method of the vehicle body shape, and establishes a new generation of model design based on the geometric law of the line shape of vehicle body so as to enhance the viability of vehicle serialization, and provide a basic premise for design strategy research.