In offshore oil and gas development project, the two platforms are relatively moving due to wind load, wave motion, ship berth and so on. The bridge piping movement is driven by the bridge structure which is connected with the platform. In order to ensure the safety of platform production, the bridge piping stress analysis is usually taken into account, but the influence of bridge structure on the bridge piping stress analysis results is less concerned, or the bridge structure has been modeled as no mass rigid element, which should result in the unreal result of bridge piping stress analysis. Therefore, in this paper, an offshore platform bridge piping will be studied by applying CAESAR II software, the simulation method of incorporating bridge structure into bridge piping model will be introduced in detail. The displacement distribution of piping support on bridge structure will be summarized, and the calculation differences of the stress level, support load, flange leakage ratio and piping natural frequency based on bridge piping model and joint model will be compared and analyzed, which provides valuable reference for the design and analysis of bridge piping in future.