In order to research accumulated deformation and dynamic properties of coarse-grained soil foundation under cyclical train loading, the dynamic triaxial test was conducted, and analyzed the effects of cycling stress ratio (CSR) and confining pressure on accumulated deformation behavior. Based on the results of the dynamic triaxial tests, an accumulated deformation model which considers the impacts of confining stress and CSR was developed. The results show that the loading times-accumulated dynamic strain curve starts to transfer stable type to damage type when CSR is 0.3. With increasing of CSR, softening index is increasing. When CSR is smaller than 0.3, the softening index is decreasing with the increasing of confining press; but when CSR is larger than 0.3, the softening index is increasing with the increasing of confining press. The accumulated deformation model can reflect the effects of CSR and confining press on accumulated deformation, and it can predict the accumulated deformation development tendency. The model parameters have explicit physical meaning. Hope for the design and maintenance of coarse grained foundation provide the reference.