In order to accelerate the transformation of modern rail transit manufacturing to intelligent manufacturing and help digital intelligent design, a method of parametric design for high-speed rail boarding space is proposed, and the possibility of using parametric design to drive the design innovation of high-speed train passenger rooms is explored. By analyzing the space requirements of different passengers, combined with the size range and actual situation of high-speed train carriages, a Grasshopper operation logic link is built to create a parametric design platform for high-speed train space. Form an intelligent digital design method for high-speed train carriages to produce richer and more changeable and demand-oriented design schemes. At the same time, the combination of artificial intelligence and parametric methods is explored, and the possibility of designing the high-speed train boarding space in the future is proposed, so as to make the high-speed train boarding space more humanized, digital and intelligent.