On this basis,the anomalous percentages of precipitation,Z index,homogenization of precipitation and temperature are used to analyze the characteristics of droughts and floods for Dandong.

This paper conducts the computation classification for the spring flood and drought situation in He Zhou by using the spring precipitation data in four weather stations of He Zhou during 1965-2004,and the z index,and the index of regional flood and drought.

The variabilities of the summertime flood and drought events over the lower reach of the Yangtze River Valley (YRV) are examined in this paper by employing monthly mean observation data from 1958 to 1999.

Regional features of summer drought and flood in Northeast China and corresponding abnormal water-vapor transportation;

By using monthly averaged NCEP/NCAR reanalysis data of the atmospheric circulation and the data of summer precipitation in 40 meteorological stations in Shandong province from 1961 to 1998,the climate characteristics of precipitation in the summer of Shandong are analyzed,and the atmospheric circulation anomalies of drought and flood have been compared and analyzed.

Based on grade data of drought and flood of Anhui in recent 554 years, variable regular are given by calculation method of departure coefficient, kurtosis coefficient, number of appearance, accumulative anomaly and so on.