综合论述了水下隧道在穿越江河湖海时所有的优势，介绍了水下交通隧道的设计与施工概况，讨论了水下隧道勘察设计、施工的几项关键技术，详细介绍了水下隧道施工的常用方法。

It is briefly introduced that when passing over or crossing rivers, lakes and seas, underwater tunnel construction method is preferred to be adopted for its summed advantages. The survey of design and construction, key construction technology and frequently-used construction method of underwater tunnel are also discussed in this article.