Abstract: Abstract：In recent years, PM2.5 related air quality and improvement has been a hot topic of social and public concern.In this study, 339 prefecture-level cities in China were selected as the research objects, and the gravity center model and local spatial autocorrelation method were adopted to conduct an empirical analysis on the spatial pattern evolution of atmospheric PM2.5 pollution concentration in 339 cities in China.The results show that: (1) from the center of gravity analysis, the geometric center of gravity of atmospheric PM2.5 pollution concentration in China from 1998 to 2016 is located near Weihe Plain, and the degree of atmospheric PM2.5 pollution in eastern and northern China is relatively higher than that in western and southern regions respectively.(2) from the perspective of local spatial autocorrelation analysis, areas with positive spatial correlation of "high-high" type from 1998 to 2016 are mainly concentrated in North China, Central China, East China, cities along the middle and lower reaches of the Yangtze River and Sichuan Basin.The area with positive spatial correlation of “low-low” type is mainly concentrated in southwest and northwest, and also appears sporadically in some cities of northeast and Fujian.Finally, the spatial pattern of atmospheric PM2.5 pollution in China is preliminarily analyzed.