In order to analyze the impact energy-controlling performance of nitrogen-inflating hydraulic hammer, the power bond graphs of both the stroke and the backhaul are presented based on the theory of power bond, and the state equations of the nitrogen-inflating hydraulic hammer are established. Afterwards, a simulation model, which takes into consideration the high-frequency variation of motion state of hydraulic hammer and realizes the fast calculation of main simulation parameters, is built in the AMESIM system. Then, a simulation is performed using the existing design parameters of DBS500 hydraulic hammer, and the error between the simulated and the test results is found to be less then 6%. It is thus concluded that the proposed model is basically correct and reliable.