Abstract: The re-analysis assimilates data,including total aerosol optical depth(AOD) and low cloud cover(LCC)were used to estimate the correlations between aerosol and LCC and LSP in autumn in the Sichuan Basin(SB). Two variables distributed as a same sign of spatial patterns. Another distribution like the two-branches centering around Chengdu and Chongqing respectively with opposite sign of variability. There was a strong link between AOD and LCC when AOD distributed as its EOF2 and EOF3. The effect of AOD's change on LCC lasted only two days. The date of variabilities distribution was an important factor of impact of AOD on LCC: if the high value of AOD and LCC appeared at the same time(October),high LCC would increase; otherwise(September),the low LCC would increase and high LCC decreased.