In order to solve the problem of adjusting the poles distance during the aluminum electrolysis responses, it needs to design a laboratory lifter and improve the process of the electrolytic aluminum by simulating. This paper analyzed the structure and working principle of the electrolytic cell lifter control system. The model of dynamic characteristics of asymmetric cylinder controlled by symmetric four-way valve of the system was established. The control performance of the system was simulated and analyzed. By simulating, the value of gain in the model was determined. According to high precision demand of the control system, the influence factors to the control system precision were analyzed, and the error of system was received. The system was calibrated when the system was stable to improve the control system precision.