Abstract: The medium range change of the subtropical high of June,1979 on the influences of the heat sources over Tibetan Plateau are studied by using a global circulation spectrum model. The analyses of the simulation results show that the heat sources over Tibetan Plateau plays an important role in the process of frontogenesis, the intensity of frontal zone and the upper tropospheric westerly jet associated with it. When there are heat sources over Tibetan Plateau, both the frontal zone and westerly jet are stronger.There are very important mutual relations between the sensitive heating and latent heating.After the sensitive heating and latent heating are isolated,it departs much from reality that the significance of them are studied separately.