For the topographic surveying in shallow coastal waters,there are some problems of high risk of running aground,low efficiency and poor safety of traditional shipborne acoustic depth measurement methods,and the cumbersome implementation process and insufficient accuracy of remote sensing retrieval of water depth and dual-medium photogrammetry methods.The low-altitude photogrammetry technology of unmanned aerial vehicle(UAV) is adopt to innovatively integrate into the navigation tide level correction model.A new topographic surveying method for shallow coastal waters on the basis of the low-altitude UAV is proposed and successfully applied in practical engineering.The results show that the method avoids the risks and limitations of traditional measurement methods effectively,and improves the working efficiency and safety significantly.The tidal level correction model during navigation in this method can eliminate the influence of tidal level error,and improve the accuracy of bottom topography surveying in shallow water area.The results not only provide a new,efficient and accurate method for the topographic survey of coastal shallow water area,but also provide a new technical idea and direction for the practical application in related fields.