Vibration device of crystallizer is the key equipment of continuous casting line. The integrated construction of the servovalve and vibration cylinder was analyzed in theory. Aiming at the actually question that the servovalve port parameters of the integrated vibration cylinder were difficult to make sure, an analyses method making sure the windows sizes of the servovalve was proposed. The matching analysis for the selected parameters between load and power was made.The result shows the selected parameter satisfy the need of actually requirement.