Based on the solution about the relationship between loads and elastic deflection for unlimitted identical foundations and multi-layer materials, using software Bisar 3.0, Everstress FE (according to analysis and finite element method) and based on the standards of some countries, together with some experiments, this article proposes some suggestions to increase the accuracy when measuring the elastic modulus of base and pavement structure using the steel bearing plate and the standard of 22TCN 211-06.