By analysing of the seasonal series of Qinghai-Xizang Plateau temperature anor-maly index, it is shown that there are two significance periods and two less significance ones,these are three-year and five-year, and seven-year and eleven-year respectively.. The sign changes of Plateau temperature anormaly in autumn is often observed, and earlier than the changes of anormal signs of western Pacific subtropic high and ultra-long-wave amplitude.