Atmospheric circutation characteristics associated with summer flood/drought,which is graded by a new scheme,over North China are addressed in this papar in terms of the 1951-2000 monthly rainfall and 500 hPa heights from National climate center by using the correlation,composite and singular value decomposition(SVD) methods.Results show that in North China drought/flood years prominent circulation anonmalies occur all over Northern Hemisphere,and the most significant anomalies appear in the low-latitude area from North Africa to West Asia,the Qinghai-Xizang Plaeau region,the northeast of Ural mountains,and the east of Canada.The trend of the circulation anomaly is consistent with that of summer rainfall in North China.The circulation anomalies in Asia display a "positive-negative-positive" pattern from high-latitudes to low-latitudes in summer flood years and a "negative-positive-negative" pattern in summer drought years.