In my lecture, I will mainly discuss the interannual variability of aerosol from TOMS data. I will discuss the statistical method and describe the change and impact on the climate. Also, I will talk about the variability of water vapor at the same period using NVAP data. I try to find out the interaction of these two separate but important physical elements. Finally, I try to make a database of the longtime series of TOMS and NVAP data in order to get a clear idea of the climatology.