Abstract:This paper, which is on the basis of analyzing the typhoon bogus wind scheme in MM5, in order to construct the three-dimensional asymmetrical typhoon wind field model, introduces some objective factors such as the typhoon moving speed, direction and friction into constructing the asymmetric tangential wind field, and then tries to choose reasonable radial wind scheme and to consider the wind vertical structure. By comparing of the initial field of the “Rananim” Typhoon, the introduction of the radial winds and high level anti-cyclone circulation highlights the basic characteristics of the typhoon, and coincides with the observed facts. Finally, sensitivity numerical simulation has been done, by comparing of the typhoon track and speed, sea level pressure and maximum winds, and the results show that the improved typhoon model also plays a positive effect in forecasting the typhoons track and intensity.