Abstract: The net distance between the Xuetangwan interchange and the Huangshi tunnel exit of the Kaiyun expressway (Jiangkou-Yunyang-Longgang section) is used as an example in this paper. This paper analyses the problems in the safety distance between expressway tunnel and interchange under multi tunnel, and proposes safety distance measures between expressway tunnel and interchange under multi tunnel, based on the current safety distance standard between expressway tunnel and interchange under multi tunnel.