By performing eight experiments with a high resolution barotropic model,which is integrated for 36 hours,the interaction between a mesoscale vortex and a typhoon vortex is investigated with its effect on the variation of typhoon intensity.The relationship between the spatial scale dimensions of the initial mesoscale vortex and the variation of typhoon intensity is also discussed.The results show that the interaction can intensify the maximum tangential velocity of typhoon under the condition of certain parameter ranges.