Abstract:Using 1960~2000 a summer (Jun.~Aug.) precipitation data over 34 stations of Chongqing region, the temporal and spatial variability features are studied by applying the methods of EOF, REOF, wavelet analysis. The results indicate that the summer precipitation distribution exhibits the common features as well as the spatial differences, which can be classified into four types as Northwest, Northeast, Southeast and Southwest Chongqing. There exists wetter trend over Chongqing region in the last 40 years. Generally, summer precipitation presents upward tendency and the periods of 22 a, 14a and 2~4 a. The abrupt change occurred in about 1988~1989.