Abstract: In this paper, by using data for 17 stations on Qinghai-Xizang Plateau during the period of June—August 1979, the components of the heat source, including long-wave radiation, short-wave radiation, latent heat, and flux of sensible heat are calculated. Based on these results the average atmospheric heat budget over Plateau is calculated. Having compared our results with those given by authors in China and in foreign countries who use the indirect method for calculation, the main contribution to the atmospheric heat source in our calculation is the long-wave radiation. Also, the relationships between the atmospheric heating field over Plateau and the monsoon circulation in various stages over Plateau are discussed.