太原西山特长公路隧道位于山西省太原至古交高速公路上，长约13.68km×2，为我国目前第二长公路隧道。在勘察设计中，充分借鉴了国内外长大隧道的建设经验，并邀请国内众多专家进行咨询论证，对其进行了多次优化。简要介绍太原西山特长隧道的工程概况、工程地质、隧道土建工程设计、附属工程的设计及关键技术的研究等。

Xishan tunnel on TaiyuanGujiao highway in Shanxi province is a superlong road tunnel with about 13.68km×2 length. It is so far the second longest highway tunnel in China. In the investigation and design phases, the successful experience in highway tunnel construction both in China and abroad was fully adopted and many experts were invited to hold consultation and argumentation. The article briefly introduces the project, the geological conditions,  civil engineering design, accessorial works design of the tunnel and the research activities on some key techniques.