The change and effect of East Asian monsoon is one of the main features of China's climate, especially East Asian summer monsoon, which has the most effect on distribution of rainfall in summer in China. Abnormal interdecadal change of the East Asian summer monsoon not only affects interannual and interdecadal change of China's climate but also affects China's rainfall on century time scale. Thus, it is full of meaning to research rules and effects of interdecadal changes of the East Asian summer monsoon. B...