简要介绍秦岭终南山公路隧道在设计上解决特长隧道所遇到的一些难题和困难的想法和理念，把选线、利用铁路隧道、通风、防灾救援、照明供配电、环保、监控、科学咨询等方面的设计特色和特点提供给同行们，以供借鉴和参考。

The solutions for the problems encountered in the design of Zhongnanshan extralong highway tunnel crossing Qinling mountain are presented in the paper, which include the selection of the tunnel alignment, the full use of the existing railway tunnel, ventilation, disaster prevention and emergency rescue, supply and distribution of illumination power, environment protection, monitoring and consultations. The paper can provide reference for the other tunnel designers.