Through the analysis of factors affecting the durability of the tunnel structure,and according to the relevant engineering test results and the experience of design and construction technology, improving measures of the primary support and secondary lining durability of Bohai Strait tunnel were put forward. The durability design parameters of successfully built tunnel were analyzed. Combining with the actual situation of the Bohai Strait tunnel, the engineering analogy method was adopted to get the durability design parameters of the Bohai Strait tunnel. It could provide a strong guarantee to the fixed number of 100 years of the Bohai Strait tunnel.