To address significant disturbances and unavoidable measurement noises during aeroengine transient tests in the Intake Environmental Pressure Simulation System (IEPSS), a sliding mode active disturbance rejection controller (SMADRC) is designed. Meanwhile, a particle swarm optimization (PSO) algorithm is adopted for optimizing and tuning the parameters of the proposed controller. Then, experiments are conducted on IEPSS simulation platform to verify the proposed method. The results demonstrate that the proposed controller has better noise tolerance and robustness, and eventually enhances the system comprehensive control performance.