Abstract: Using single Doppler weather radar about the radial velocity information, a simple method for estimating the divergence and vorticity is presented. The vortexes are analyzed by this method in Beijing-Tianjin-Hebei area. The result indicates that the formation of the strong meso-scale weather system is related to turn or convergence and divergence of wind filed. The vorticity cyclone is a signature recognition of heavy rain and very useful for the cumulus convection.