By constructing the evaluation index system of basic public service equalization, kernel density estimation method and Dagum Gini coefficient are used to explore the spatial and temporal evolution and regional differences of basic public service equalization in Nanjing metropolitan area from 2011 to 2020. The results show as follow .In the temporal evolution, the level of equalization of basic public services in Nanjing metropolitan area has been continuously improved, but the differences between cities still exist, showing a weak polarization feature.The spatial distribution generally shows a spatial pattern of high in the middle and low in the surrounding areas. The level of equalization in each sub-dimension of cities in Jiangsu and Anhui Provinces is obvious, with typical regionalization characteristics. The level of basic public services in Nanjing metropolitan area is increasing, and the overall regional differences are gradually decreasing. The lack of leading role in Nanjing is an important reason for regional differences. Therefore, it is necessary to strengthen the division of labor and cooperation within Nanjing Metropolitan Area, break down policy barriers, promote the leading role of Nanjing, and promote the equal development of basic public services in the region.