The human activities such as meium- and small-sized reservoirs, dams, pits and groundwater overdraft have a great influence on the consistency of hydrological data series in the Guantingshanxia Catchment since 1950. Based on the Xin’anjiang-Haihe Modle, the design flood was revised for the Guantingshanxia Catchment. The result shows that 3-day designed flood volume is 2.54×108 m3 and 7-day designed flood volume 3.55×108 m3 under 100-year flood frequency.