Long and short-term climatic curves were preliminarily established based on thecomprehensive analysis of gaxhemical information since the Late Cenozoic in the Qinghai-Xizang (Qinghai-Tibet) Plateau. The curves show that the climate in the plateau was alterna-tively dry-wartn and cod-wet during the peried of 30 - 3. 4 Ma when the plateau was not up-lifted to an enough altitude and the monam was not completely formed either. In the peried of3. 4 - 0. 73 Ma, the climate fluctuated between dryco1d and wet-warm when the plateau wasrapidly uplifted and the Asian monam was conequently formed. Since 0. 73 Ma, the climatebecame even drier when the plateau continuously are. In the Holocene period, the climate alternatively changed with a complex medel of being coo-dry, warm-wet and cold-wet. Long and short-term climatic curves were preliminarily established on the comprehensive analysis of gaxhemical information since the Late Cenozoic in the Qinghai-Xizang (Qinghai-Tibet) Plateau. The curves show that the climate in the plateau was alterna- tively dry-wartn and cod-wet during the peried of 30 - 3. 4 Ma when the plateau was not up-lifted to an enough altitude and the monam was not completely formed either. dryco1d and wet-warm when the plateau wasrapidly uplifted and the Asian monam was conequently formed. Since 0. 73 Ma, the climatebecame even drier when the plateau continuously are. In the Holocene period, the climate alternatively changed with a complex medel of being coo -dry, warm-wet and cold-wet.