Abstract: The blackbody temperature (TBB) of GMS satellite infrared images was analyzed for mesoscale convective systems (MCS) occuring in different regions of China in early August 1992. The evolution of three cases of MCSs,which located in the vortex of southwestern China,around the northwesternborder of the subtropical high and within the subtropical high,are given by the TBB isoline maps in detial. The results suggest that the density of the TBB isolines around the cold cloud top is a available clue to the nowcasting of MCS. One of MCS,which evolved into a vortex when it entered into the dissipating phase,was documented in this paper. The spirlling banded structure of the dissipating MCS reflects the upper level mesoscale high caused by the convective latent heating associated with the MCS.