On the basis of discussion about various budget equations,the horizontal pattern and vertical profiles of apparent source and sink with direct and indirect methods over the Changjiang River basin during Mei-yu heavy rain are summarized. Although the results are different and difficult to compare for each case,region or data,but this is certainly followed by an important vertical transport process of subgrid-scale,which reflects the striking effect of cumulus convection on largescale environment.Thus,for any prognostic models of heavy rain over the midlatitutes,it is necesary to add the parameterization of subgrid-scale motion.