Based on forging conditions, the physical model of main control system for 80 MN high speed forging hydraulic press was build, considering the different pressure action areas in both sides of movable beam, all forging working conditions were equivalent to the movement of movable beam driven by unsymmetrical cylinder, the hydraulic spring stiffness in both sides of movable beam and equivalent mass with all working conditions were deduced respectively. Furthermore the calculation formulas for hydraulic inherent frequency of main control system were presented. The max speed and max acceleration under stable operation condition were checked using sine forging curve as ideal displacement curve. The results show that the hydraulic system design of hydraulic press satisfies requirements for dynamic performances.