Abstract: In order to clarify the influence of the slit position, slit width and pressure extraction ratio of the wall-attached air duct on the dust control effect of the fully mechanized face, the FLUENT software is used to numerically solve the established long-pressure short-draft ventilation roadway model. The results show that with the increase of the distance between the slit of the attached air duct and the head-on, the dust concentration in the tunnel space decreases first and then increases. When the slit distance is 13 m head-on, the cyclone air curtain will control the dust concentration within 6 m head-on, the dust concentration at the driver of the comprehensive excavator will drop to 120 mg/m³, and air curtain dust control is effective. The width of the slit will affect the wind speed of the cyclone split wind. The wider the slit is, the greater the wind speed of the cyclone is. However, when the slit width exceeds 0.1 m, it will inhibit the dust control effect of the cyclone air curtain. When the width of the slit is 0.05 m, a large amount of dust collected at the mouth of the exhaust pipe is drawn away from the roadway, the driver of the comprehensive excavator is not disturbed by the dust. As the pressure extraction ratio becomes larger, the dust concentration of the tunnel decreases first and then increases. When the pressure extraction ratio is 1.0, the high-speed jet of the compressed air cylinder is completely absorbed by the exhaust cylinder, the dust is effectively controlled to the head, there is no dust diffusion in the roadway, and the dust control effect is the best.