Abstract: The radial velocity and reflectivity characteristics of various mesoscale and microscale weather systems, in terms of the value of vertically integrated liquid, reflectivity shape and intensity, echo moving velocity, was statistically analyzed and compared by using new generation weather radar data for Guangzhou in this paper. The feature and classification of a kind of the radial velocity and reflectivity characteristic was described, especially in the statistical analysis on the radial velocity. The result showed that the severe wind area and the surface layer divergence occurred in radial velocity or storm-relative mean radial velocity map in 80% of the thunderstorms, including downburst. The convergence flow pattern was resulted in more than 50% of severe rainfall, and 24% of it was brought about by inverse wind area. Meso-cyclone was usually used as indicator to the local very-short-range torrential rains, hail and gale, in spite of its low probability. The diagnosis and identification of severe storm would be improved by means of these characteristics combined with the synoptic analysis.