By analyzing the energy consumption feature of aluminum profile extrusion machine, the basic energy flow of the Variable Displacement Pump Volume Speed Regulating Extruder is defined in the production process. Based on power bond graph, the energy consumption features of the hydraulic system were modeled, and then the state equation was derived, and the dynamic characteristics were simulated by Simulink simulation software. The simulation results were compared with the experimental data collected in order to verify the reliability of the model. The energy distribution characteristics of the hydraulic system and the influence of process parameters on the energy consumption of the hydraulic system were analyzed by simulation. The results show that, the main reason for the low efficiency of Variable Displacement Pump Volume Speed Regulating Extruder is the overflow energy loss, and second reason is that the variable pump efficiency is low. The overflow loss of the relief valve could be reduced or cancelled or other variable flow transmission method was adopted to realize the extrusion machine of hydraulic system of energy saving. Increase the extrusion speed under the premise of ensuring the quality of aluminum profile, is conducive to reducing energy consumption and production costs.