Abstract: The paper discusses the thought of the two algorithms for calculation of earthwork in site leveling with the section method and the Delaunay triangulation method，and mainly focuses on the triangle in Delaunay triangulation algorithm to calculate earthwork.First of all，according to the elevation of the three vertices of each triangle in the Delaunay triangulation，it is to determine filling，cutting or the joint of filling and cutting in this triangle area.Then，the appropriate algorithm is adopted to calculate the filling-cut volume in the triangle area.Finally，small software for calculation of earthwork in site leveling is developed with Java 3D programming language.The cases confirmed that the algorithm used in this software is correct and effective.

Key words: Volume of earthwork, Section, Discrete point, Delaunay triangulation network