The anomaly of the blocking high over the North east Asia and the lager scale circulation feature in summer of 1998 are analyzed.The interannual changes of blocking high over the NE Asia, the circulation background and the relationship between the anomaly of blocking high over the NE Asia and SSTA over the Pacific Ocean in summer of 1979~1998 are studied. The results indicate that the “+-+” pattern of 500hPa geopotential height anomaly from high to low latitude is the typical when blocking days are more than normal over the NE Asia,and v.v.The SSTA over the Pacific Ocean causes the teleconnection wave train and the 500hPa geopotential height anomaly over mid high latitude over the East Asia.It might be one of reasons leading to the blocking high anomaly over the NE Asia.Under the circulation background of the higher geopotential height over the mid high latitude, the blocking high over the area of Ural promotes the establishment and development of the blocking high over the NE Asia.The blocking high over the area of Ural happening more frequently than the normal may be one reason of the more blocking high over the NE Asia in summer of 1998.