Abstract: Using the NCEP reanalysis data, conventional aerial and ground conventional data, automatic weather station data, the August 13th, 2010 and July 3rd, 2011 Aba southeast rainstorm and debris flow are discussed. The results show that: two strong precipitation weather process occurred in different circulation background, but with the position of subtropical high, plateau trough, cold air and other factors closely related to the ground. The two process of heavy precipitation area for upper-level divergence, low- level convergence zone, and the region has a strong upward motion, water vapor convergence obviously. From the moist potential vorticity analysis, strong precipitation area generally occur in the troposphere and lower negative center of MPV1 and lower MPV2 positive center of range.