There is a good correlation between snow cover of the Qingzang Plateau in winter and the summer rainfall in China,especially in the Changjiang River valley.The inundation of the Changjiang River valley in 1998 was closely related the anomaly snow cover of the Plateau in winter,and the situation was a reflection of 500hPa mean height field in spring and summer.But its correlation effected by the interannual and decadal variation of 500hPa mean height field is complicated.