Abstract: In order to reduce the disturbance energy loss in the process of inlet diversion and outlet jet flow of parallel fan station, taking the parallel connection of two fans as an example, a high-efficiency and low resistance parallel station structure improvement mode is proposed, and the ventilation efficiency and local resistance coefficient formulas of the fan station are deduced based on the principle of aerodynamics. The similar model and the numerical model based on FLUENT software are established to measure the resistance of the improved structure, and the variation laws of the efficiency of the machine station, the local resistance coefficient and the wind speed of the tunnel section are verified. The results show that the efficiency of the improved structure is about 1% higher than that of the general structure fan station, and the local resistance coefficient is about 12% lower.