Abstract: Objective  To analyze the spatial accessibility of tertiary hospitals in Tongzhou District of Beijing before and after the relief of non-capital functions,  so as to provide reference for further optimizing the spatial layout of medical resources.  Methods  We collected the resource allocation data of tertiary hospitals and population distribution data in Tongzhou District before and after the relief of non-capital functions,  and analyzed the spatial accessibility of tertiary hospitals in Tongzhou District by comprehensively using the methods of service area analysis,  spatial accessibility analysis and local spatial autocorrelation analysis based on geographic information system (GIS). Results   The population and tertiary hospitals in Tongzhou District are mainly distributed in the 155 km2 area,  also called the city sub-center. From 2020 to 2025,  the spatial accessibility of tertiary hospitals has changed from single core radiation to dual core radiation,  and the overall level and equality have improved. By 2025,  the 30-minute-service area of tertiary hospitals will cover 94.39% of the residents in Tongzhou District. The allocation level of tertiary medical resources in the city sub-center and surrounding areas is higher than the average level of the whole region. There is a degree of tertiary medical resource aggregation in the city sub-center and surrounding areas. Conclusion  After the relief of non-capital functions,  the level of tertiary medical resource allocation in Tongzhou District makes it convenient for most residents to enjoy high-quality medical services. The centralized layout of tertiary medical resources meets the needs of city sub-center construction and “two districts” construction.

Key words: non-capital functions relief, geographic information system, health resource allocation, spatial accessibility, tertiary hospitals