Abstract: The decompression and cooling process of a superconducting module is highly complex, and the pressure stabilization phase is prone to interference from factors such as temperature, flow rate, and pipeline resistance, leading to pressure imbalance in the helium tank. In order to enhance the stability of the helium tank pressure, an SMC-PID (Sliding Mode Control-PID) dual control method is proposed. This method employs a dual control structure that combines the rapid response characteristics of valve control with the high efficiency of pump control. By introducing an integral sliding mode controller into the dual control, the system's robustness to disturbances and model parameter perturbations is improved. To address the chattering issue of sliding mode control, a dead zone function is designed in the control law, enabling the transition between sliding mode control and feedback control during stable operation. Simulation results show that compared to traditional PID dual control, the SMC-PID dual control reduces the helium tank pressure overshoot by 12.5%, the rise time by 73.3%, and the adjustment time by 40%. Under the same disturbance signal, the fluctuation amplitude of helium tank pressure decreased by 64.3%, the standard deviation decreased by 74.9%, and it exhibits better robustness to model parameter perturbations.