Abstract: In this paper, the oscillation of summer temperature in Northeast China and its characteristics of atmospheric circulation during 1910—1980 are discussed. The relationships between the summer temperature in Northeast China and the sea surface temperature in the equatorial eastern Pacific are also analyzed. The study results obtained show that: ① The change of summer temperature can be divided into three cold and two warm periods. The characteristics of atmospheric circulation in the cold periods are quite different from that in the warm periods. ②There is a good negativecor relation between the summer temperature in Northeast China and the sea surface temperature the equatorial eastern Pacific