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Object: This paper is concentrated on the key problems of natural condition, line planning, landing sites, transportation mode, cross section and longitude section of Bohai strait subsea tunnel. Methods: Bohai strait subsea tunnel is mainly researched by investigation of natural condition, comparison of analogous engineering, analysis of transportation mode, and the features of railway tunnel and highway tunnel. Results and Conclusions: A scheme of full deep tunnel is suggested in Bohai strait. The proposal planar line of subsea tunnel starts from Laotieshan cape of Lvshun, ends at Donggang in Penglai, passing through Beihuangcheng island, Daqin island, Tuoji island, Beichangshan island, Nanchangshan island from north to South between the line section. The line is 114km long. One shaft is set up separately for ventilation at Laotieshan cape, Beihuangcheng island, Beichangshan island and Donggang. Landing point in Shandong Peninsula is located at Donggang in Penglai and another landing point in Dalian is located at Laotieshan cape. Railways are used as transportation method and a piggy back system is proposed. To avoid all kinds of risks, the tunnel is about 80m below the sea floor. The linear of longitudinal section is designed as W shape and the maximum longitudinal slope is set as 18‰, then the tunnel's length is about 125km. Cross section of the tunnel is a combination of double tubes and single tube, serving for the trains and other functions individually. The train speed is designed as 250km/h.

Preliminary Considerations of the Planning for Bohai Strait Subsea Tunnel