By analysis of hourly GMS-5 infrared TBB image and intensive observation of Doppler radar, it indicated that the 6 heavy rain events were created by the mesoscale system due to the impact of the mesoscale and microscale low voxtex shear in Sichuan and Yunan. Mesoscale Convective storm Complex(MCC) in the TBB pictures likely occurred in the TBB low value area of ≤-75℃,and on the other hand,due to the squall line,vortex zonality echo and the mesoscale floccus echo on the Doppler radar echoes, likely occurred in the echo intensity area of ≥40dBz.