At present, the world situation is relatively stable. Recycling and the use of civil air defense projects in peacetime is becoming one of the most important issues at home and abroad. The research in dugout utilization in plain city is carried out simultaneously with the study of underground space. Dugouts in mountain cities (e.g. Chongqing), have special properties different from the plain cities .For many factors, such as lighting, traffic, psychology and behavior, the efficiency and value of the development and utilization of dugout entrance space is much larger than the internal space. Therefore, the design of entrance space has become the focus of the mountain city dugout development. And then it presents the design principles on the use of dugout entrance space-dynamic, diverse, humane, technology and art integration-after investigating and summarizes its utilization overview, advantages and disadvantages in Chongqing. The purpose of the study is to provide new ideas on the re-use of the mountain dugout space and the sustainable development of urban space in concept and design.