Abstract: The regional characteristics and variable trends of summer precipitation were diagnosed and analyzed in Yangtze river catchment,based on every summer precipitation data of 107 stations from 1958 to 2002.The result show,there are 3 main spatial oscillation patterns and 7 sensitive centers of precipitation change.The summer precipitation is noted increased above 95% confidential level in the centers of Yangtze Delta,Poyanghu plain and the upper Xiang-Han river area;which increasing rates are 25.8 mm/10a,69.4 mm/10a and 31.0 mm/10a.But the summer precipitation is noted decreased at 99% confidential level in Min river catchment,which decreasing rate is 40.7 mm/10a.The summer precipitation is most in 1980s only in centers of Min river catchment and Hanshui-Yangtze three gorges,but most in 1990s in the other centers.The summer precipitation had declined abrupt change in 1990s in Poyanghu plain,in 1985 in Jianghan-Dongtinghu plain and in 1979 boat in Yangtze Delta and in Hanshui-Yangtzer three gogres,but increased abrupt change in 1963 in Min river catchment.All sensitive centers of precipitation change have obviously interannual and interdecadal oscillation periods.