Abstract: In the background of urban stock development, the matching of supply and demand as well as the equitable allocation of green space with disaster prevention and risk avoidance functions have become key issues affecting urban safety. Taking the central urban area of Chengdu as an example and using streets as the basic units, an index system covering four dimensions of green space supply (quantity allocation, transportation organization, emergency services, and spatial layout) and three dimensions of social demand (population density, disaster risk, and built environment) were constructed. By applying a supply–demand coupling coordination model, the spatial differentiation characteristics and fairness pattern of disaster prevention green spaces were systematically evaluated. The results indicated that: (1) Both the supply and demand of the green space with disaster prevention and risk avoidance in central Chengdu showed a "high in the center, low in the periphery" ring-shaped distribution pattern. (2) The supply–demand matching types were dominated by high-level balance in central areas and low-level balance in outer areas. The overall coupling coordination degree was relatively poor, with most streets in a state of primary or barely coordinated development. (3) There were significant differences in spatial equity, among wich the lack of equity was prominent in some streets in the north due to the lagging supply. The findings provide a quantitative basis for optimizing urban safety framework and allocating disaster prevention resources more effectively, which is helpful to realize the balanced distribution of disaster prevention benefits of green space and the coordinated development of urban system with high quality.