In this paper, regression analysis and correlation analysis were used to study the seasonal differences of meteorological factors on PM2.5 and PM10 concentrations in Changsha. The results showed that: ( 1 ) In spring the weathering factors that had largest correlation coefficient of PM2.5 and PM10 concentration, are daily precipitation and daily maximum temperature, in summer is maximum wind speed, in autumn is daily average relative humidity, in winter were daily precipitation and maximum daily temperature. ; (2) In autumn, R^2 (P 〈0. 0...