The echo features of the torrential rain occurring in the JiangHuai area, Anhui province, during the Plum rain season of 1980 are analyzed. It is found that the echoes are of a combined type of convective cloud belt or crowd mosaicked in the stratiform clouds and the precipitation mechanism of this torrential rain is very similar to that of the tropical convective precipitation. Most probably it is substantially a kind of severe rainstorm resulting under the action of the low-level convergence when the tropical air masses move north-ward. Thus a physical model for the torrential rain in the Plum rain season is presented.