Abstract: Based on data from conventional weather stations, Fengyun meteorological satellite, Doppler weather radar, automatic weather station, and NCEP and EC reanalyses with high time and spatial resolutions, mesoscale characteristics of two severe short-time precipitation events on 30 August (called "8.30") and 8 September 2014 (called "9.08") in the west of southern Xinjiang were analyzed. The results show that the "8.30" event took place in the northwest airstream ahead a high pressure ridge, while the "9.08" event appeared in a straight westerly belt in bottom of the vortex and trough. Mesoscale convergence lines at surface and low level were important influencing systems to the two severe short-time precipitation events. Short-time precipitation occured at the maximum gradient of TBB for the "8.30" event and maximum range for the "9.08" event. The two events had significant differences in radar echo characteristics and had obvious low and high quality heart convective storms. Severe short-time precipitation was caused by meso-γ supercell for the "8.30" event, its strongest echo height exceeded 6 km. So, it was a high quality heart convective storm and had the characteristics of low-level convergence, upper-level divergence and rotation. Severe short-time precipitation was caused by meso-γ common storm for the "9.08" event, and its strongest echo height exceeded 2 km, which was a low quality heart convective storm and low-level wind convergence. Radar velocity for the two events displayed that the boundary layer convergence lines played an important role in the generation and enhancement of convective storms.