By using a global spectral model of quasi-geostrophic barotropic vorticity equation including diabatic heating,a series of numerical experiments of multi-refraction of atmospheric waves on perfect basic flows are run.The 16 perfect basic flows and 4 heat sources of tropical SSTA are considered and 30 days are taken for model integration. Results show that: (1) Disturbance excited by the heat source usually can have two or three branches of the wave trains, and the second or the third branch of the wave trains bifurcate from the first branch, or the third branch wave train bifurcates from the second.(2) For some basic flows, the first branch wave train disappears after maintaining two weeks or longer, and the other wave trains propagate still.(3) The second branch of wave train is the strongest in most cases and two branches of wave trains have the tendency of confluencing and focusing.