In view of the problem that discrete topographic data or empty area of topographic data existed in the waterway engineering results in creation of the topographic surface which is not smooth enough and occurrence of deep concave or protruding,we propose to use Kriging interpolation method to directly interpolate and fill the discrete topographic data of waterway area,and then build the model of waterway topographic surface by BIM technology.The result shows that the terrain surface model generated by Kriging spatial interpolation of discrete terrain data is closer to the actual effect and the trend of terrain,and can truly show the current three-dimensional terrain of waterway,and it may serve as reference for surveying and mapping units to carry out BIM work.