Abstract: Tropical cyclone is divided into the two regions in which the scales of time、space and physical quantity are all different.Making use of the scale analysis and perturbation method on the two regions of Tropical cyclone the groverning equations of barotropic and barochinic models are obtained respectively. In the two models the stream and pressure fields are solved analytically,the obtained structures are approximately consistent with observation.It is shown that the inner and outer regions of Tropical cyclone have different governing equations. The inner region is governed by the cyclonic wind and an evolution equation, the outer region is governed by the gradient wind and another evolution equation.