Traditional photogrammetry and airborne LiDAR scanning for intertidal zone surveying face challenges such as difficulty in image control points layout,producing aerial triangulation and creating topographic map.Based on the analysis of the advantages and shortcomings of using these two technologies independently for tidal flat surveying and mapping,a method is proposed to fuse the photogrammetric aerial triangulation point cloud and the airborne LiDAR point cloud to construct a real-time 3D model based on the terrain features of intertidal zone.Experiments demonstrate that the method can give full play to the capability of photogrammetry in object identification and data extraction,overcome the numerical uncertainty caused by extracting elevation from LiDAR point cloud in traditional map drawing,make up the limitations of the two individual techniques,make them play their respective advantages,and provide a convenient and effective new method for tidal flat surveying and mapping.