Abstract: In order to improve the flood discharge capacity of Banqiao river sluice and ensure that the flood discharge requirements of Banqiao river sluice meet the standard flood planning conditions,the original site of the sluice is expanded.The 3D calculation model of Banqiao river sluice is established by Inventor software.The stress and displacement distribution values of main girder and longitudinal girder of each sluice are calculated by ANSYS finite element software.The rationality of the design of the expanded Banqiao river sluice is evaluated.