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Objective To analyze the coupling and coordination relationship between the supply of medical resources and the utilization of medical services in Chengdu-Chongqing economic circle from 2016 to 2021, so as to provide reference for optimizing the allocation of medical resources. Methods Based on the comprehensive evaluation index system of medical resources supply and service utilization, a comprehensive evaluation model and a coupling coordination degree model were constructed to analyze the coupling and coordination relationship between medical resources supply and service utilization in Chengdu-Chongqing economic circle from 2016 to 2021. With the use of exploratory spatial data analysis, the spatial-temporal evolution characteristics of medical resources coupling coordination were analyzed. Results From 2016 to 2021, the development levels of medical resources supply and service utilization in Chengdu-Chongqing economic circle were 0.11-0.13 and 0.14-0.15, respectively, and the relative degree of development changed from shortage of medical resources (0.78) to mutual complement and promotion of development (0.92). However, the proportion of cities subject to lagging supply of medical resources was still large (68.8% in 2021). The level of coupling coordination changed from 0.47 to barely coordinated development. By 2021, only Chongqing and Chengdu had a good coordinated development. The LISA diagram showed that the "high-high" areas increased year by year, and the "cold point" effect disappeared, but there was still a "highland" phenomenon centered on Nanchong. Conclusion The development level of medical resource supply and service utilization in Chengdu-Chongqing economic circle is stable and rising, but the overall level is low and the regional gap is obvious. The coupling coordination level needs to be further improved, which is mainly limited by the lagging supply of medical resources. The spatial positive correlation of coupling coordination degree is gradually enhanced, but the spatial heterogeneity is still prominent. [ABSTRACT FROM AUTHOR]