Based on monthly rainfall data of CMAP and reanalyses of NCEP/NCAR from 1979 to 2010,the meridional shifting of East Asian jet stream(EAJ) in upper troposphere and its regional climate impacts have been investigated.An index is defined to describe the meridional shifts of EAJ.The results have demonstrated that there is notable interannual variability for EAJ,with periodicities of 2—3 a and 8 a.When the EAJ locates at latitudes more northern than normal(more southern than normal),the wave-like anomalous rainfall pattern signed with the positive—negative—positive(negative—positive—negative) signs is observed form lower to higher latitudes in East Asia sector along with negative(positive) anomalies of temperature in subtropical western Pacific,and simultaneously significant positive(negative) anomalies in regions including the eastern and northern parts of China and Japan.In region of the eastern parts of Siberia,negative(positive) anomalies are also found.Although in years when the position of East Asian jet shifts anomalously,circulation anomalies look equivalent barotropic.The meridional shifting of EAJ and the temperature anomalies in the regions from the middle-lower reaches of Yangtze River in China eastward to Japan are found to be related to the anomalous meridional circulation induced possibly by the anomalous diabatic heating in tropic regions including the western Pacific and the South China Sea,and related to the eastward propagation of mid-latitude wave energy.