Abstract: Some of the characteristic features of the atmospheric oscillations over the Tibetan Plateau and surrounding areas were investigated by using OLR data during the eight years. The basic periods were the quasi 8-day and 30-50 days, except the seasonal cycle. The quasi 8-day oscillations were related to the activities of the Plateau vortex. The low-frequency (30-50 days) OLR modes were closely tied to two moisture channels which reached the Tibetan Plateau from the Bay of Bengal and the northwest of India during the rainy season. The results of this paper indicated OLR data were useful for the investigalion of the Plateau.