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Objectives: The study of medical facilities accessibility is a critical method to analyze the convenience of accessing medical services in a region. Existing research mainly focuses on potential accessibility (PA) research, and few studies have analyzed the revealed accessibility (RA) based on the actual use of medical facilities. Methods: The main urban area of Chengdu City, Sichuan Province, China, is taken as the study area, and the actual travel distance decay function is fitted by introducing the user̓s actual choice weight and the comprehensive service capacity of healthcare facilities using droplet travel data to improve the three-step search method model for calculating RA. Then, we compare it with the PA calculated based on the service capacity of medical facilities and potential medical needs to analyze the degree of mismatch between them, identify the types of community access to medical facilities, and analyze their spatial distribution characteristics. Results: The PA is mainly affected by the travel time, and the difference between the central area and the peripheral area is large, but the difference between different districts is not obvious. The RA is mainly affected by the number of medical trips, and the difference between each district is obvious. 182 communities with “RA>PA” are mainly distributed in Chenghua District and Jinniu District, and 243 communities with “RA

Objectives: At present, China has invested a large amount of resources in improving primary medical and health services. Aiming at 15 min medical circle, a variety of primary medical security facilities such as clinics and medical insurance stations have been built. Evaluation of their accessibility is of great sig‐ nificance for rational planning and optimization of facilities. Methods: We made full use of pan-map resources such as online map, population thermal map, path planning service and isochronous circle range service, and improved the Huff-based two-step floating catchment area method (Huff 2SFCA) from the perspective of travel capacity difference and day and night population distribution difference,and formed a 15 min nucleic acid sampling circle evaluation framework. Results: Taking Shanghai as an example to analyze the accessi‐ bility of medical facilities in 15 min living circle, the results show that: (1) In all administrative districts ex‐ cept Baoshan and Pudong in the study area, the area coverage and population coverage of the 15 min sam‐ pling circle are above 90%, among which Hongkou and Jingan have the highest accessibility. (2) Affected by the separation between work and housing of commuters, the areas with large permanent residents tend to have high accessibility during the day, and the accessibility decreases at night. On the contrary, the areas with industrial clusters have significantly higher accessibility at night. (3) The surrounding development zones such as Pudong and Baoshan show the characteristics of polarization of accessibility. The accessibility of well-developed residential areas is high, while the accessibility of developing new industrial parks is low. The accessibility distribution of the old city is relatively more balanced, and can better meet the needs of the elderly and the working population.Conclusions:The results show that the current spatial layout of sam‐ pling stations considers the travel behavior of residents, and can meet the needs of most residents for test‐ ing near their residence and work place. For areas with high or low accessibility, the resource allocation of sampling points can be optimized according to the diurnal variation of population distribution. [ABSTRACT FROM AUTHOR]