The regional and department allocation of land use index is the key problem of National Territory Development Planning System. The most important task in this round of territorial space planning remains the optimal allocation of land use indexes of different types with the full consideration of the development wills of local governments at all levels. The task should be in line with the actual development of China's diverse physical geographic regionalization and economic and social regionalization, in particular, the actual land use in three different regions, namely, urbanization-forming region, urbanization-developing region and urbanization-shrinking region with the implementation of state will and national strategy. In this paper, the authors seek to establish a multi-scale, multi-region and multi-context simulation framework of China's Territorial Spatial Planning Model (CTSPM) based on the Spatial Computable General Equilibrium (SCGE) model, and proposes the actual application contexts in the safety simulation of territorial space for the support of the national territorial spatial framework simulation and analysis of multiple national development contexts and land index allocation planning as well as the analysis of its socio-economic influences and ecological environmental influences. The authors hope that this framework would serve as a "debate" platform for the "game" for obtaining land index between regions and departments and also an analytical framework for a scientific national territorial and spatial planning and a deep understanding of the cross-regional influences of national spatial safety.

The increasing frequency of flood hazards in recent years highlighted the contradiction between urban construction and flood control. It is important to re-examine the core principles and methods of disaster prevention planning that focused on flood prevention infrastructure and sponge city planning for landscape ecological infrastructure. This paper proposes that, in the context of territorial spatial planning, the core principle of rainstorm flood safety pattern should be "policy integration". The integrated policies do not conflict in spatial layout, but lead to the same goal and result. Based on this core principle we proposed a theoretical framework of rainstorm flood control pattern in land space. Under this framework, the identification of stormwater control elements is the prerequisite, and the key approach is to establish an integrated relationship between stormwater safety elements and land use spatial structure, resource use, and infrastructure systems through controlling measures and guiding measures. This study aims at realizing the safety goals and forming spatial patterns on different spatial scales. To better interpret the theoretical framework, this paper takes the Zhenguan town, Wanzai county, Jiangxi province as a case study to explore and test the operationality and application value of the theoretical framework in practice. This research provides a new perspective and theoretical basis to achieve flood safety pattern.

Urban function, agricultural function, and ecological function make up the entire territorial spatial function system. Scientifically grasping the quality of regional territorial spatial functions and deeply revealing their coupling coordinated relationships is an important basis for achieving sustainable development of territorial space. In order to explore the development status of territorial spatial functions in karst areas of Southwest China and their characteristics of spatial structures, Guangnan, a typical karst county, was taken as a study area. Based on the construction of urban, agricultural, and ecological function evaluation index systems, the paper evaluated the function quality and its spatial characteristics with the help of comprehensive evaluation method and exploratory spatial data analysis method, used coupling coordinated degree model to examine the coupling coordinated status of territorial spatial functions, and further explored the territorial space development of coordinated development of urban-agricultural-ecological functions. The results showed that: (1) The urban function quality and agricultural function quality showed mainly low values, and the ecological function quality had mainly high values. The low and high values of comprehensive function quality tended to be evenly distributed. And the spatial distribution of different functional qualities was different. (2) The development of all the four territorial spatial function qualities had a positive correlation, which was mainly "high-high" and "low-low" agglomerations, and there were differences in geographical distribution. (3) Territorial spatial functions in karst areas had a great influence on each other, and the distribution of low- and high-coupling areas was significantly different. Of all the functions, the coupling degree was the lowest in the fuction of construction land. (4) The coupling coordinated relationship of territorial space functions could be divided into four levels from imbalance to coordination, and the differences in their spatial distribution were similar to the differences in the territorial spatial comprehensive function quality. The countermeasures of territorial space coupling coordination areas could effectively promote the sustainable development of territorial space for karst areas, and improve the territorial space function quality in karst areas. The results of this research provide references for territorial spatial balanced development and optimized regulation in karst areas of Southwest China.

The frequent occurrence of natural and man-made disasters in the process of urbanization has seriously restricted the survival and safe development of cities. We used Chuzhou central city, one of the representative disaster prone areas, as a case study to measure safety risk. We constructed a safety risk index system, based on a typical Pressure-State-Response (PSR) conceptual framework. We then used coupling indication model to compound the risk assessment results of each single disaster, and quantitatively evaluated the distribution characteristic of urban safety risk. Finally, we used geographic detector to analyse the impact mechanism of the driving indicators of urban safety risk. We found that: (1) The proportions of urban safety risk grades from low to high were 2.49%, 8.71%, 41.08%, 30.47% and 17.25%, respectively, with medium risk dominating the study area. Spatially, the safety risk of central area was higher than that of the surrounding areas, that is to say, it showed a declining trend from the central city to the suburbs. (2) The order of the explanatory power intensity of the driving indicators on the safety risk was as follows: population density (0.404) > GDP density (0.402) > building disaster tolerance (0.095) > vegetation coverage (0.078) > road network density (0.013) > risk of land use type (0.012), and the explanatory power of the results was enhanced by interaction of factors. The research will provide a new theoretical perspective and framework for urban safety risk assessment, and help for disaster risk management in high risk areas.

China is experiencing the fastest urbanization process in the urban development history of the world. However, several urban issues, such as environmental pollution, extensive and disorderly development, and insufficient governance, have risen to hinder the sustainable development of Chinese cities. As a new type of urban governance mode that implements the requirements of the Central Urban Work Conference, urban physical examination has been prioritized on the working agenda of local governments, in order to solve striking problems including "urban diseases" and to promote high-quality development. However, scholarly discussions on the methods and implementation strategies of urban physical examination have received little attention. Guangzhou is selected as a pilot city for carrying out nationwide urban physical examinations. It has certain innovations in terms of the selection and optimization of indicator evaluation system, diagnosis of urban issues and exploration of implementation strategies. Taking Guangzhou as an example, on the basis of reviewing territory space security, urban physical examination and related research, a basic framework for urban security assessment research was initially established on urban security dimension. Subsequently, the principles of operability and rationality was adopted to select the indicators, and an innovative technical method for screening and optimization of the index system was proposed. Based on more than 10000 questionnaire surveys collected from government departments and citizens, we combined the top-down transmission control with the bottom-up social demands, and further proposed that policies and regulations, standards and norms, action plans, construction projects could be integrated to promote the urban physical examination. Furthermore, the effectiveness of urban safety improvement was continuously monitored through social satisfaction surveys and physical examination information platforms. This study can provide some references for conducting urban physical examinations throughout the country.