Previous studies have shown that the static side pressure of the granular goods transported by railway truck is a triangular linear distribution along the height of the loose particles, but the calculated results are often inconsistent with the actual results. With the development of computer technology, simulation analysis and nu- merical calculation become important research methods. Based on particle flow theory, the model of railway truck granule material was established. The static side pressure of granular goods with different bulk density and dif- ferent internal friction angle was simulated and analyzed. Then, the simulation value was compared with coulomb force, and the reliability of the simulation results was verified by experiments.