Compared to traditional 2D design, the dimension and depth of data information included in bridge 3D design are more diverse and abundant. In order to study a universal method for bridge design in the 3D environment, this article is based on the commonly used component forms in railway bridges and the characteristics of the components. It proposed a method through intelligent template parsing to loft beams, bearings, piers, foundations, and other bridge components along the longitudinal direction or along the vertical direction. Based on the association between various component parts in bridge structures, three dimensional railway line information is extracted through collaborative interfaces, virtual base points are constructed, and components are regarded as rigid bodies. By using rotation and translation matrix, the 3D attitude control function of the components is studied. A series of key engineering parameters for determining the spatial position of the components are proposed, achieving rapid and accurate creation of bridge 3D models with commonly used span types. This spatial positioning method has been successfully applied to the TongSuJiaYong highspeed railway, and providing reference and basis for the study of 3D forward design for railway bridges.