The traditional surveying methods have some disadvantages,such as low accuracy and time-consuming in surveying bridge and other river-crossing structures.Based on the discussion of the principle of 3D laser scanning measurement,this paper applies the method of ground 3D laser scanning to the surveying of river-crossing structures.Taking the survey of an inland river bridge as an example,the coordinate transformation of a single site cloud after registration is carried out to obtain the results of target point cloud,and the point cloud coordinates of several checkpoints are compared with RTK coordinates to verify the accuracy.It is shown that the positional accuracy of ground 3D laser scanning technology is superior to 6 cm,which meets the requirements of urban river-crossing structure modeling.The experience could be used in the application of 3D laser scanning technology in municipal surveying.