Abstract: In a numerical experiment with a cold surge in Dec. 1982,its structures are examined and interactions between middle and low latitudes circulations at the time discussed preliminarily. The result shows that the horizontal flow of the cold surge,best-defined near the surface,is seen as a strong and rapid northeasterly running south along the east side of the Tibesan Plateau and modes of gravity wave propagating south off its front edge. Meanwhile,the Hadley cell keeps intensifying with the southward advance of the surge,whose north-inclined columns of positive vorticity and convergence are consistent with the updrafts of a cold front associated with it. It intensifies equatorial disturbances and the westerly jet at upper troposphere in mid-latitudes. Simultaneously increased energy links up middle and low latitudes circulations through its dispersive effects.