Abstract: Using FY-2D satellite data,NCEP 1° × 1° reanalysis data and surface observation data,two torrential rain processes,form 20th to 22nd July,2008 and 20th to 22nd July,2012 in Sichuan caused by the interaction between plateau vortex and southwest vortex have been compared and analyzed.The results show:1) the heavy rainfall area and the upper trough which guides the plateau vortex to move have close relationship,the migration and variation of upper trough decides the general area of the heavy rainfall.2) Although the generation and development of convective clusters which cause the two torrential rain processes have some differences,but in the end will be combined to form a MCC,the heavy rainfall locates on the TBB maximum gradient area of convective cluster,and usually closes to the cloud core,in the Northwest of the cloud core.3) Two torrential rain processes both have the low-level convergence and high-level divergence,and correspond to the? strong vorticity and? strong ascending motion,and the divergence,vorticity and vertical velocity? both increase.4) The vapor source of the two torrential rain processes has some differences,but the vapor both gradually enhances,and water vapor convergence center corresponds to the area of heavy rainfall.