Abstract: According to collecting water observation data during three year,in the middle of Gansu province,the relationships between runoff coefficients and materials,slopes of collecting-water surface,rainfall intensities carer analysed.Combining with the every hour rainfall data recorded by rainfall recorders on the 19 meteorological stations that distributed on the east regions of the Yellow River within Gansu Province,the averaged runoff coefficient and its mean square deviation were estimated,which provides scientific basis for applying the collecting water techniyue to agricultnre.