基金This research was supported by The Gansu province meteorological bureau and university cooperation project"Numerical Si mulation of the Influences of Tibetan Plateau Vegetation Variability on Regional Cli mate"The science andtechnology bureau of Sichuan province applicationtechnology research and development project"Study of Ecological SystemEvolutionin Sichuan andits Mechanism"(07JY029-036)The opening project of the Cheng-duinstitute of plateau meteorology China meteorological administration"Study of Influence of Tibetan Plateau Vegetation Variability on Regional Cli mate and its Mechanism"(LPM2006020).