为优化多功能浮力舱设计方案，进一步发掘半潜船潜在作用，以多功能浮力舱可提供的最大净浮力、生命周期内平均年成本两个指标为目标函数，建立综合考虑技术性能及经济性能的多功能浮力舱双目标优化模型，并采用加权理想点法将双目标优化问题转化成单目标问题实现模型求解.通过实例计算确定了多功能浮力舱的选材以及相应的多功能浮力舱优化设计方案，验证了模型的有效性.通过敏感性分析总结了钢材价格和板材腐蚀速率对多功能浮力舱平均年成本与可提供的最大净浮力的影响规律，可为多功能浮力舱的优化设计提供理论依据.

In order to optimize the multi-functional buoyancy tanks design scheme, and further explore the potential role of the semi-submersible ship, taking the maximum net buoyance originated in multi-functional buoyancy and the average annual cost in the life cycle as the objective functions, a bi-objective optimization model of multi-functional buoyancy tank was established, which integrated the technical and economic performances. The weighted ideal point method was used to transform the bi-objective optimization problem into a single-objective problem to solve the model. The material selection and the optimization design scheme of corresponding multi-functional buoyancy tanks were determined by the example calculation, and the validity of the model was verified. The sensitivity analysis was used to summarize the influence of steel price and corrosion rate on the average annual cost of multi-functional buoyancy tanks and the maximum net buoyance available, which provide a theoretical basis for the optimal design of multifunctional buoyancy tanks.