Based on the NCEP/NCAR reanalyzed monthly sea surface pressure(SLP),the 160 stations monthly precipitation of China and the Met office and British atmospheric data center(BADC) monthly sea surface temperature(SST) dataset,the constitute and formation cause of the inter-decadal and inter-annual variations of summer rainfall anomalies in northeast China have been analyzed by using the periodical analysis,SVD and REOF methods.Results show that:(1)the inter-decadal and inter-annual variations of the summer rainfall anomalies in northeast China is relatively equipoise,but the local inter-annual variability in the southeast is slightly stronger than that in the northwest;(2)on the inter-decadal and inter-annual scales the strong(weak) east Asia summer monsoon corresponds to the excess(deficient) precipitation in northeast China;(3)there is no direct connection between El Nino events and the summer monsoon in northeast China,i.e. the former has no close relation with the summer rainfall in northeast China.