Abstract: The integral rotary Stirling cryocooler is widely used because of its crankshaft or eccentric mechanism; however, the unbalanced force and torque cause vibration and noise. Therefore, this study analyzed the existing problems of the commonly used single counterweight model and used simulations and experiments to verify that the single counterweight could not solve an unbalanced moment. Subsequently, a double counterweight model was proposed. Parametric modeling was performed after matching the cryocooler, and the optimal design of the double counterweight model was obtained via multi-objective optimization in Insight.