Referring to the successful experience of subsea tunnels having been completed,the engineering analogy method can be adopted to design supporting structure form and parameters of Bohai Strait tunnel. Through the investigation and comparative analysis, composite lining is used. For all levels of the surrounding rock,corresponding combination supporting measures are adopted in the primary support design. Tunnel mainly adopts limited emissions scheme,and reduction factor method is used to calculate the water pressure on lining. In the stress analysis of lining structure, safety coefficients under different water pressure are analyzed,and the design parameters of secondary lining are preliminarily determined.