Abstract:In order to implement dynamic control of water storage buildings in the lower reaches of the Muwenhe River in flood season, the fuzzy analysis method was applied to make the flood season staging based on the daily rainfall data from the three rainfall stations of Fanjiazhen, Beiwang and Dawenkou from 1980 to 2011. Meanwhile, the return period method was used to determine the flood grading on the basis of the annual maximum peak discharge data from the Beiwang station.