Abstract: The circulation of MCC(Mesoscale Convective Complex) that occurred in 23—24 July 1992 are examined by conventional surface and upper air data. The objective analysis revealed distinctly the meso-α-scale circulations associated with the MCC on the vorticity and divergence fields. There are a mesoscale negative vorticity circulation with divergence in the upper troposphere (above 250hPa),and a positive vorticity circulation with convergence in the lower troposphere (centered at 700hPa). The major features of MCC structure are associated with the warm core in middle-to-upper troposphere and the cold air dome near the surface. No distinct midlevel cyclonic vortex is found at 500hPa. A couple of vorticity(negative in the northern portion and positive in the southern portion) was found on the surface instead of the meso-high and the trailing cyclone which are found in northern America. The conceptual model of MCC circulation is presented.