Regarding the problem of sand blocking in the entrance channel of a tributary of Chaohu Lake，the research of BIM technology application in the calculation and maintenance analysis of the erosion and sedimentation of the entrance channel is carried out. On the basis of summarizing the application ideas and processes of BIM technology in the maintenance analysis of the entrance channel，the Civil 3D surface analysis technology is used according to the measured hydrological terrain data，and the quantitative analysis of the erosion and sedimentation changes in the entrance area of the channel is carried out. The parametric channel model is created by the subassembly composer，meanwhile the channel scale is analyzed in combination with the water level conditions to propose maintenance measures. The results show that BIM technology can accurately and efficiently complete the maintenance analysis of the waterway at the entrance，which can provide references for the deepening application of BIM for waterway maintenance in future.