Abstract: Based on the cloud amount of ISCCP D2, the spatial distribution characters and the temporal variation of cloud amount over 3 regions of China were analyzed using system cluster analysis method. The variation trend of cloud over China was discussed. It concludes that in north east of China the cloud amount increases and decreases in the west of China and in the north of China. The singular value decomposition (SVD) modes based on two fields between winter total cloud amount over Tibetan Plateau and summer precipitation in China were computed and a credibility of teleconnection was analyzed by SVD. The result shows that the correlation between winter total cloud amount over Tibetan Plateau and the summer precipitation in the parts of north and northeast China is obvious.