Abstract Objective This study aims to explore the spatiotemporal disparities in the equalization of basic medical and health services in China, in order to provide reference and guidance for promoting the equalization process of basic medical and health services and ensuring the fair enjoyment of citizens’ right to life and health. Methods Based on the theory of Structure-Process-Outcome(SPO), a comprehensive evaluation index system of equalization level was constructed with 22 core indicators of basic medical and health services, from the three dimensions of medical and health investment, health service utilization, and medical service effectiveness. The Generalized Principal Component Analysis (GPCA) model was used to calculate the equalization level of basic medical and health services in 31 provinces, municipalities, and autonomous regions from 2011 to 2021. Furthermore, the kernel density estimation and Moran’s I model was employed to analyze the correlation and disparity at the spatial level. Results 1. From a national perspective, the level of equalization of basic medical and health services in China has significantly improved from 2011 to 2021. The mean score of national equalization level increased from -0.605 to 0.174, with an increase of 128.75%.