Abstract:WRF model is used to simulate meso-α vortex rainstorm of 21—22 Apr. 2007. The results indicate that (1) The genesis of the vortex relates with the terrain condition in the west of Hubei province to some extent. The low pressure trough system provides necessary circulation background for it. The TBB data retrieved from FY-2C satellite reflected the entire activities of the meso-α vortex. (2) Analysis on the thermal-dynamic structure of the vortex in its strongly developing phase indicates that there is strong ascending motion on its right side, while sinking motion on its left side. Warm and moist air climbes upon the cold air at the mid-low level which forms the secondary upward movement. On the left side of the vortex exists an obvious barocline frontal zone and dry cold air enters into the back vortex. The southerly component of wind makes more contribution to moist transportation than the westerly component of wind. (3) Comparing NOAH LSM scheme with thermal diffusion one in WRF moel, it is indicated that NOAH scheme is beneficial to vortex center deepening, so it can produce more precipitation. Such enhancement mainly distributes around the vortex, while there is no obvious difference in other areas