Abstract: Both basic public service and common prosperity are inclusively beneficial and care about people’s livelihood，with their values coupled. Based on the provincial panel data from 2011 to 2020，the modified coupling coordination model is used to estimate the coupling coordination degree between the equalization and accessibility of basic public services and common prosperity；and the non-parametric kernel density estimation method is used to describe the development trend and evolution characteristics of the coupling levels of various systems in the country and its four major regions. The results are：First，in terms of comprehensive development level，the basic public service qualities and common prosperity development levels of the country and the four regions are on the rise，and the levels of the former are generally lower than those of the latter；secondly，the coupling levels of two subsystems and three subsystems exhibit similar characteristics in their development trends and variations，and the relative levels increase year by year with great disparities between and within regions；finally，in terms of the dynamic evolution of the three subsystems in China，the coupling development level is a steadily growing，with the central and northeast regions differentiated in some years. Therefore， on the basis of a comprehensive understanding of the matching status of basic public service quality and common prosperity，countermeasures are put forward to promote the further integration and development of basic public service quality and common prosperity.

Key words: basic public service, common prosperity, equalization, accessibility, coupling effect