城市地下空间的形式及规模大多是辅助城市地上空间的规划，而目前主流的“地下街+地铁站”商业模式在一定程度上忽略了其本身所具备的军用价值，如何将这一特性融入城市空间体系是当前我国城市迈向更高质量发展的一个难题。为融合城市地下空间与军事功能，对未来城市地下空间的结构形式、基建设备、功能定位提出设想，考虑到应急情况下的紧急避难、医疗救援、物资补给与心理建设，将“地下街+地铁站”主体结构进行横、纵向拓展； 并基于军民融合与平战结合，增加一定的军事功能； 利用横、纵通道与主体结构的连接，最终设计出概念作品——“城市方舟”。

Urban underground spaces are mostly used to assist urban surface spaces planning. To a certain extent, the current conventional business model of the underground street/metro station systems disregards their military usefulness. Integrating military features into urban space systems is a difficult problem and requires higherlevel development. In this paper,  ideas for the structural modes, infrastructures, and functional positioning of the underground space in the future are proposed. The main structure of an underground street/metro station system is expanded horizontally and vertically, considering emergency refuges, medical rescue and supplies access, [JP2]as well as psychological construction in emergency situations. The military features are added based on militarycivilian and peacetimewarfare integration, and the horizontal and vertical passages are connected with the main structure. Thus, the working concept of the City Ark is developed.