Abstract: In order to study the influence of an agricultural-photovoltaic complementary power generation project in Shaanxi province on river regime and flood control in the study area, this paper adopted HEC-RAS software to establish a onedimensional hydrodynamic model and combined with analysis of river channel evolution, hydrological analysis, water surface line calculation and river scouring calculation to study and evaluate the flood impact of this agri-photovoltaic complementary power generation project.The finite volume method is used to discretize the one-dimensional river channel, and the flood level of the project is calculated numerically.The results show that the height and length of backwater at Liao-Huo Expressway cross-river bridge are 0.23 m and 107.48 m under the condition of once-in-50 years flood.X319 County Road cross-river bridge backwater height 0.13 m, the length of backwater is 60.75 m; The height and length of backwater are 0.15 m and 70.09 m respectively at cross-river bridge of Zheng-Xi Passenger Dedicated Line.After considering the influence of accumulated levee high water level of the bridges, the existing levee height within the project site can meet the 50-year flood standard, and the river section can meet the 50-year designed flood discharge requirements.The 50-year designed flood will not affect the project safety.The erosion depth of Luofu River where the project is located, is 0.5 m, which is relatively shallow, and the river current erosion will not have a great impact on the stability of the bank slope.Under the condition that the condition of water and sediment does not change significantly in the future, the riverbank will remain relatively stable in a certain period of time.The flood impact study can provide technical support for the subsequent flood impact assessment of the project, and can provide reference for the flood assessment of similar projects.