Combining with the experience of Beijing, Shanghai, Xiong'an, and other cities and regions, this paper explores the connotation of urban safety system, and combs the internal logic of urban safety system from the perspective of whole life cycle. Starting with three kinds of planning systems:master, detailed and special plan, the paper constructs an urban safety system which is transmitted and implemented from strategic and tactical level to operational level, and clarifies positioning, functions and key points of urban safety content at different levels to form the main ideas for building urban safety system. This paper also focuses on exploration of urban security systems at the master planning level and puts forward planning strategies and control measures of planning ahead at the strategic level, responding systematically at the tactical level and landing measures at the governance level.

Disaster prevention and mitigation in mountainous cities is an important research direction of urban safety. From the perspective of comprehensive disaster prevention theory and on the basis of clarifying the characteristics of mountainous city disasters, this paper explores the correlation between the current research directions of comprehensive disaster prevention in mountainous cities and spatial forms, traffic road systems, and ecological landscape systems. It also discusses the current trend of disasters in mountainous cities and proposes a comprehensive disaster prevention planning system for mountainous cities under public emergencies at the macro-medium-micro levels. With the advent of the post-epidemic era, improving the health and resilience of the human settlement environment will become a focus of urban planning research so as to provide guidance for comprehensive disaster prevention planning in mountainous cities.

We systematically review the research process of healthy city at first. Then we combine successful experience and existing problems of Chinese cities in responding to the COVID-19 to present a path which leads to a healthy, livable, resilient and ecological urban environment. In particular, we put forward three kinds of healthy urban design paths of "region-systemnode", corresponding to the six-in-one urban design strategy of "ecological health-life health-healing health-environmental health-design health-treatment health". Finally, we perfect it into a visual expression of urban space.

Based on the concept of "resilient city", the paper constructs an idea of resilient urban public space and explains its connotation and characteristics. Combined with the anti-epidemic measures of various countries in the COVID-19, it summarizes a system of "technical resilience-institutional resilience" of urban public space. It is shown that the technical resilience depends on healthy planning interventions, including integrating the health impact assessment into the whole process of planning, improving the planning of urban emergency service capacity, establishing a resilient public space system made up of "hub-nodeemergency flow", and coordinating the emergency space of "integration of peace and epidemic". Moreover, urban public space's institutional resilience depends on sound and smart social governance, including establishing the emergency response system, matching the emergency responsibilities, rights, capabilities of grass-roots communities, improving laws and regulations and other policy tools, and applying intelligent platforms for prevention and control. Technical resilience and institutional resilience can establish a new paradigm for urban public spaces to respond to public health emergencies.

Public emergencies have brought new challenges to urban construction and urban governance due to the complex causes, widespread impacts, and diverse hazards. Based on the connotation and impact of smart city construction, the article analyzes the function and role of smart citiy in responding to public emergency and in response to urban governance problem in public emergency. It also puts forward the path of smart city construction to promote urban governance transformation under public emergencies, which includes enhancing big data prediction and service capabilities of smart cities, using smart government to promote efficiency and coordination of urban emergency management, increasing smart emergency refuge space planning and construction efforts, developing smart manufacturing and smart logistics to enhance the urban emergency supplies guarantee function, improving the resilience of urban community management technology with smart community construction, providing reference for solving "big city disease", and improving the ability to respond to public emergencies and the level of urban governance.

In the context of global climate change, public health emergencies brought by special climate conditions to cities cannot be ignored. Urban planning is an important means for government to ensure public health security. It is of great significance to improve the health level of urban residents in cold regions to prevent and control public health emergencies brought by urban climate in cold regions from the perspective of urban planning and make certain planning response.Based on the analysis of climate characteristics influence on public health emergencies, and combined with the challenges brought by urbanization, land use, traffic system and public space, this paper puts forward the planning and response strategies of public health emergencies in winter cities from two aspects:improving the resilience of social governance and human settlements, aiming at promoting the health of residents in winter cities and promoting the sustainable development of human settlements.

The COVID-19 epidemic has triggered deep thinking among scholars in the field of urban and rural planning. How to build a resilient urban space environment that is conducive to people's physical and mental health has become a hot topic once again. In this paper, concepts of resilient city and healthy city are combed and analyzed. Based on a literature analysis, many common characteristics between the two concepts are presented in terms of environmental, social, managemental aspects, especially in front of the problem of environmental pollution.. In the future, the studies of resilient city and healthy city are supposed to have certain intersection. Moreover, the research on resilient city is more closely related to urban space planning, which makes it easy to develop systematic implementation framework from the perspective of space planning. Combined with the current and future development needs of Chinese cities, this paper proposes the strategies and development approaches of China's resilient urban space planning in four dimensions, namely, form layout, natural environment, public facilities and social life and provides a reference to build a sustainable urban living environment.

The threat of public emergencies in Chinese rural areas should arouse the whole society to a high degree of vigilance. The resilience of the rural settlements is an important ability to resist public emergencies. Based on the concepts of rural ecological resilience, economic resilience and social resilience, this article expounds the type characteristics of rural public ecological emergencies, economic emergencies and social emergencies, proposes that in the current national land and space planning, village planning should comprehensively consider the response strategies for rural public emergencies, emphasizing the planning and coordination of ecological space, production space and living space. It is necessary to combine rural emergency self-rescue with prevention and control. The improvement of the resilience of rural settlements is the constructional goal of village planning, so as to provide a guarantee for the sustainable development of rural settlements. On this basis, this paper constructs a theoretical framework for the relationship among "resilience of rural settlements", "rural public emergency" and "village planning" to guide village planning and rural constructional actions.

The COVID-19 is the major public health event that has the fastest speed of transmission, the most extensive infection and the most difficult control and prevention since the founding of new China. Summarizing this public health incident, we can find that technology has played a supporting role in many areas but it also has shown its weaknesses and shortcomings. During the "14th Five-Year Plan" period, the innovation-driven national strategy and the construction of the national public health system will provide greater opportunities and new higher requirements for the development of our country's science and technology. How to further leverage the support of science and technology in major public health emergencies and how to carry forward scientific spirit are of great significance. Specifically, we should adhere to the value orientation of "people-centered" and promote the scientific literacy of the whole people in the popularization of science as well as increase reform and innovation in the scientific and technological system and mechanism.

As of February 2021, the COVID-19 epidemic outbreak has been spreading across nearly 200 countries, causing over 100 million people infected and over 2 million people dead. The governments, private businesses, non-profit organizations, families and individuals in different countries have implemented various policies and strategies to minimize COVID-19 impacts according to their governance mechanisms, economic structures, social systems, and lifestyles. This paper briefly reviews the major epidemics in human history and introduces policy responses to COVID-19 and effectiveness evaluations taken by individual countries. After analyzing policy responses and categorizing them into Asia mode, Western mode and China mode, we summarize a package of policy measures and implement standards, including public protection and epidemic prevention, transportation and travel management, information track and virus detection, personal prevention and quarantine, financial aid and social support. The effectiveness evaluation system comprises 5 indexes and 15 elements. This paper provides suggestions for decision makers and the general public in concerted efforts to overcome COVID-19 and facilitates growth of the community of shared future in public health.