Based on FNL 1°×1°reanalysis data, FY-2F TBB data and conventional meteorological observation data, a continuous rainstorm weather process occurred in Guizhou from May 24 to 26, 2019 was analyzed. The results showed that the continuous rainstorm process was affected by thermal depression, and had no cold air influence. It was a typical rainstorm in warm area. The upper trough and the shear line of the middle and lower layer provided the synoptic scale background for the rainstorm, and the surface convergence line was an important factor triggering convection. The atmosphere was characterized by dynamic and thermal instability before the rainstorm.During the night of the 24th, the surface convergence line remained stable in central Guizhou, triggering the formation of meso-βscale convective cells and developing into meso-αscale system. The convective development was vigorous, the extension height was high, and the influence area was wide. During the night of the 25th, although the convergence line moved quickly, the organization of the triggered Meso-β Scale convective cells was weak, and no meso-α scale system was formed. Therefore, the local rainstorm was strong. In addition, the generation of rainstorm corresponds well to the large value region of water vapor flux divergence gradient, the cold cloud region with TBB≤-52 ℃ and the large value region of TBB gradient, and the region with TBB≤-65 ℃ is conducive to heavy rain.