Abstract: Numerical experiments of factors affecting the motion of a typhoon vortex have been made with a divergent barotropic primitive equation model,the results of which show that:(1) Provided that there is no environmental wind,the typhoon vortex would move northwestward at speeds relevant to the tangential velocity,storm radius and f field patterns,The greater the outer tangential velocity(outside of the radius of maximum winds) and the typhoon radius,the greater the north component of the vortex motion uill be. (2) Under the condition of uni-form environmental winds,the typhoon movement is subject to the advection of the basic flow. β effects and transverse acceleration to the left of the steering flow,which is the dominant force. The speed ratio between the storm vortex and steering flow is larger in the east flow than in the west flow while the vortex direction deviates more from the basic flow in the west flow than in the east flow. (3)The vortex has a secondorder dynamic component in the direction of the gradient of absolute vorticity of the steering flow. (4)It is easier for the typhoon vortex to deepen in a west flow with shear than in a uniform west flow,so that it moves more to the left of the steering current.