长江三峡水利枢纽工程建设中重大技术问题的决策是建立在大量科学试验和专家论证的基础上，三峡工程水电站压力管道和蜗壳技术结构型式的选择不仅是重大的技术经济问题，也是关系水电站长期运行问题，文章介绍了三峡工程水电站压力管道和蜗壳技术型式选择及决策。

The article introduced the selection and verification of the structural pattern of the penstock and spiral case of the TGP power-station. The decisions on the key technical issues in the construction of the TGP were made based on a huge number of scientific tests and verifications. The selection of the structural pattern of the penstock and spiral case in the TGP power-station is not only an important technical and economic issue, but also an issue relating to the long-term operation of the power-station.