Based on aerosol optical depth(AOD) data derived from MODIS sensors onboard the Terra satellite and NCEP/NCAR reanalysis data set from 2000 to 2013,the principal modes,which show the linkage between AOD and near surface downward solar radiation flux(DSRF) in East Asia in summer,have been explored with the singular value decomposition(SVD) method.The principal mode of AOD is further examined in association with East Asian summer monsoon.The distribution of summer AOD averaged from 2000 to 2013 shows that there are two high value regions(>0.9) in East Asia.One is in the conjunction part of Shandong,Henan,and Hebei provinces,and another is in central part of Jiangsu province.However,the values in Fujian,Taiwan provinces and their nearby ocean surface are less than 0.4.The DSRF increases from south to north,just like the AOD distribution.By using SVD method,a positive correlation between AOD and DSRF has been found under the influence of seasonal trends.By calculating the variance contributions,this paper confirms that the seasonal trends are more important than interannual variability in determining the in phase variations of AOD and DSRF.Left time coefficients of the leading SVD mode(SVD1) have been used to conduct correlation analysis.Results suggest that,in June(except 2013),when both AOD and DSRF values are high in eastern China,the convergence and ascending motion will be stronger than normal from the southeast China to the south of Japan.As a result,summer precipitation will increase.This is due to a fact that the location of the western Pacific subtropical high in June extends southward,resulting in less precipitation in northern parts of eastern China eventually.An anomalous warmer area appears in North China due to the more net surface solar radiation flux.In August,when AOD anomalies are negative over the land,DSRF is also less than normal.August precipitation will be less(more) than normal in the south(north) of China,along with an anomalous cold area in North China.These changes imply that when the aerosols are less than normal in the northern part of East Asia,the total cloud amount is more than normal,and rain will increase,resulting in the decrease of DSRF there.All of these results indicate that the seasonal evolution of East Asian summer monsoon plays an important role in regulating the variabilities of AOD and DSRF.