The weighing platform of the truck scale is a load-bearer, which is used for bearing a load. Its structure has many forms, in this paper, the finite element analysis of a structure with u-beam which is currently the most widely used for different loading modes, the traditional method of structural analysis of truck scale is to simplily the platform as a simply supported beam. As the model is too simplified, the result of this method will be unreliable and it cannot make part analysis about stress and strain . In this research, ANSYS was used to model, and loaded analysis. Through different loading, get the structure of weighing platform stress distribution and deformation. By analysing,we give reasonable proposals and provide valuable reference for the design and production of truck scale .