In this paper,using a global spectral model of quasigeostrophic barotropic vorticity equation including diabatic heating,we studied the probable mechanism for SSTA to affect summer atmosphere circulation.Results show that the SSTAs in the tropical Pacific have notable influence on summer circulation,and the response to the SSTA in eastern equatorial Pacific is more visible than that to the SSTA in western Pacific warm-pool.The negative SSTA in western Pacific warm-pool can effect waves rising and falling on circulation,however,the positive SSTA in eastern equatorial Pacific can not.Either positive SSTA in western Pacific warm-pool or negative SSTA in eastern equatorial Pacific can create an teleconnection in vorticity field and meridional wind field.As negative SSTA in western Pacific warm-pool and positive SSTA in eastern equatorial Pacific occur at the same time,the variation of meridional wind field are very complicated,responses spread all over the Northern Hemisphere,and perturbantions show a character of stationary waves.