In order to investigate the effect of meso-scale topography on vortex self-organization,five numerical experiments,whose integral time is 72 hours,are performed using a ƒ-plane quasi-geostrophic barotropic vorticity equation model with a topographic term.Results show that:without the topographic term,the quasi-final structure is a typhoon-like vortex with spiral bands;with the topographic term,the quasi-final structure is a quasi-circlar vortex without spiral bands,but with two low vorticity areas inside.The two quasi-final vortex centers may be above 100km apart.