Abstract: By discussing the analysis methods of river regulation flood on the lack of data, we dissert the limitations of each method.The flood investigation comprehensive analysis method and Hydrological analogy method are used to analyze the flood of Fuyuan River channel regulation.After estimating and comparing the design flood results of each flood control section, the flood values are determined.And we discuss the practicability of flood investigation comprehensive analysis method applied to design floods in small watershed lacking data.