Abstract: An SD (system dynamics) flow chart for rational pricing of high-speed railways was drawn.Based on the flow chart,a simulation model and the corresponding equations were presented.The SD model can be used for simulation during the pricing process.The ideas of price policy makers can be reflected in the SD model,and the parameters in the model can be controlled as necessary,so that it has excellent controllability and flexibility.The pricing of Jing-Hu (Beijing-Shanghai) high-speed railway was taken as example of simulation.The simulation result shows that the variation of prices and its influences on gross transport earnings and profits are accordant with the system dynamic consequences,which indicates that the proposed model is feasible.