Abstract: In recent years, with the owners of bridge landscape design requirements increasing, a variety of bridge curve shapes have emerged as the times require, most of which are steel structure bridges. It is quite difficult to show the design intention of 2D drawings with a conventional structure with space curve shape. Although design only takes up 70% of the total cost of the whole building life cycle, it decides 5% of its total cost. If uses the BIM technology with a high degree of visual data, high integration and good coordination in design stage, could completely show the intention of the design institutes, improve the machining precision of steel plate, improve the construction organization, reduce construction waste, but also provide accurate and reliable model for the implementation of BIM technology of a late bridge pipe carrier. At present, the complex steel structure bridge direction starts from real application of BIM technology design is still blank. BIM does not have the characteristics of mold design, is truly the first step the whole life cycle of BIM application from the beginning of design take the key.