Jinhai Lake is a scenic tourist attraction in Pinggu District, Beijing. Some villages and hotels here undertake special functions - they are usually lively and relaxing leisure living places. In case of sudden situations such as natural disasters, they can be quickly converted into emergency facilities through rapid recruitment, rapid adjustment, and rapid transfer. This is the public infrastructure for both emergency and emergency use. Since the beginning of this year, China's mega cities have actively and steadily promoted the construction of public infrastructure for both emergency and emergency use, making positive progress in experience promotion, scenario construction, and project promotion. The concept of "dual use for emergency response" is not a new concept to address the shortcomings of urban emergency capacity construction. In 2021, the Central Committee of the Communist Party of China and the State Council issued the "Outline of the Construction Plan for the Chengdu Chongqing Double City Economic Circle", which proposes to promote the implementation of the dual use transformation of public facilities for both emergency and emergency purposes, and enhance the capacity for emergency and emergency conversion. Since the second quarter of this year, in response to the new changes in economic operation, the National Development and Reform Commission and other departments have planned and implemented a batch of reserve policies, providing strong support for sustained economic recovery. The construction of public infrastructure for both emergency and emergency use in mega cities is an important part of it. The on-site meeting of the National Development and Reform Commission on the construction of "emergency and emergency dual use" facilities further clarified the concept of "emergency and emergency dual use" facilities: these facilities have functions such as tourism and health care in daily life, and can be immediately converted into emergency venues in case of major public emergencies. The relevant person in charge of the National Development and Reform Commission stated at the meeting that the construction of "emergency and emergency dual use" facilities is a systematic project. The concept of "emergency and emergency dual use" should be integrated into the overall urban planning, and the relationship between the government and the market, cost and benefit, and the relationship between "emergency" and "emergency" should be well handled. Industry insiders have analyzed that the "dual use" public infrastructure will organically combine daily use and emergency use, in order to create an infrastructure system that has both daily operational functions and emergency response capabilities. This type of facility can effectively fill the gaps in the emergency capacity construction of mega cities, while improving the tourism and living quality of mega cities, and better coordinating development and safety issues. At present, the "emergency and emergency" facilities in various regions are mostly used for similar purposes to traditional public infrastructure, such as parks, sports stadiums, hotels, etc. In emergency situations, they can meet the needs of emergency isolation, temporary installation, and material support after emergencies such as epidemics, earthquakes, floods, and fires. Industry insiders have introduced that traditional infrastructure construction mainly considers daily usage needs, while "emergency and emergency" public infrastructure requires its effectiveness in both daily and emergency situations, thereby effectively improving usage efficiency and public safety guarantee capabilities. This requires the construction and improvement of emergency roads, tunnels, bridges, etc. in the transportation field, the construction of energy facilities that combine daily and emergency energy supply in the energy field, and the construction of communication networks with backup functions in the communication field. Li Chao, Chief Economist of Zhejiang Securities, believes that promoting the construction of public infrastructure for both emergency and emergency purposes reflects the policy approach of "coordinated development and security", which will promote the improvement of disaster prevention and avoidance capabilities in mega cities, fill public health gaps, and better respond to sudden emergencies; On the other hand, it reflects the detailed implementation of China's urban renewal measures, which are being improved