Abstract: Articulated tram is taken as the calculation model, the principle and calculation process of its gravity center, axle load and wheel load are introduced. Then, according to the deduced formula, a software system is designed to calculate the axle load and wheel load based on VS2010 platform and the SqlServer 2008 database by using the C# language. The developed system features data query, storage, edit and delete functions with easy operation, therefore has practical application value.