从对航空及航运的影响、通行能力和行车舒适性、行车安全与气候适应性、施工难度及工程风险等方面对桥梁、隧道方案各自的技术特性进行了分析与比较。从技术角度考虑，桥隧方案皆具有实施的可行性，隧道在航运影响、气候适应性、生态环境等方面明显优于桥梁，而桥梁则在通行能力、施工难度和风险、运营成本、行车安全、行车舒适性、景观效果等方面优于隧道。随后，运用层次分析法建立了渤海海峡跨海通道比较评价的指标体系，并确定了各指标的权重系数。通过专家打分法和隶属度函数取得各定性指标和定量指标的隶属度，最后运用模糊综合评价模型计算全桥梁、全隧道及桥隧组合方案的模糊综合评价值，全隧道方案评价得分最高，因此，推荐渤海海峡跨海通道采用全隧道方案。

Aspects of bridge and tunnel are analyzed and their characteristics are compared,such as aviation and shipping, traffic capacity and driving comfort, road safety and climate adaptability,construction difficulty and project risk, etc. Technically, schemes of bridge and tunnel are both workable. Tunnel scheme is privilege to bridge scheme on aviation, shipping, climate adaptability, ecological environment and so on. While bridge scheme has advantages over tunnel scheme on traffic capacity, construction difficulty and risk, operating costs, driving safety, driving comfort, landscape and so on. Comparative evaluation index system for Bohai Strait cross-sea channel is structured by analytic hierarchy process. And weight coefficients of every index are calculated. Membership grade of every qualitative index is calculated by experts scoring method and membership grade of every quantitative index is calculated by membership grade function. Finally, model of fuzzy comprehensive evaluation is used to calculate comprehensive evaluation value of full bridge scheme, full tunnel scheme and combination scheme of bridge and tunnel. Comprehensive evaluation value of full tunnel scheme is maximum and the full tunnel scheme is the recommended scheme for Bohai Strait cross-sea channel.