Based on 73 meteorological stations' annual precipitation data during 1961—2009 in Hebei province and its vicinity,NCEP/NCAR reanalysis data and NOAA Sea Surface Temperature(SST) data of the Pacific Ocean during the same period,the spatial and temporal distributions of drought/flood are analyzed.The relations between drought/flood in Hebei and contemporaneous anomalies of the SST field in the Pacific Ocean and the field of circulation are investigated by using Singular Value Decomposition (SVD) and composite analysis methods.The research shows that,there are mainly two patterns in the anomalous distributions of drought/flood in Hebei,with temporal variations in not only inter-annual but also inter-decadal time scale.The coupling relationship between drought/flood in Hebei and associated atmospheric and oceanic anomaly patterns with SVD analysis presents that,when the annual mean SST in equatorial eastern Pacific is abnormally low and the mean SST in the middle of the North Pacific Basin at the same time is abnormally high,it would always have flood in most regions of Hebei province,otherwise it would be a drought year.In drought years of Hebei province the positive anomalies over the southwestern of Lake Baikal and North Pole and the negative anomalies over the south of Aleutian region emerge at 500 hPa mean geopotential height fields.While the circulation anomalies display a latitudinal negative-positive-negative pattern at mid-and high-latitudes in Asia.Concurrent flood years pattern corresponded with the negative anomalies over the southwestern of Lake Baikal and North Pole and the positive anomalies over the south of Aleutian region emerge at 500 hPa mean geopotential height fields.At the same time,at mid-and high-latitudes there was latitudinal negative-positive anomalous circulation pattern in Asia.