Abstract: To solve ventilation and dust problems through controlling airflow, the paper designs air distribution device which transforms the air supply model of blowing heading face airstream directly into merry radial along the roadway wall, and analyzes ventilation and dust removal effect conditions in having air distribution device or not by numerical simulation, studies ventilation and dust removal effect conditions in different export sectional area and mounting angle of air distribution device. The results show that airstream in the airway shows a significant rotation by using air distribution device; most wind velocity is same with the main wind; the dust concentration become lower away from heading face, most of the dust is cut off nearby the inlet of hair dryers, only small part of dust fugitive; roadway working environment is good. By using air distribution device, the dust concentration in breathing zone is higher than do not use it in less than 2 m away from the heading face, then lower in more than 2 m away from the heading face. At a distance of about 5 m decline particularly evident, the dust concentration is from 900 mg/m³ to 540 mg/m³, which reduces to less than 100 mg/m³ when it is 23 m away from the heading face. When the mounting angle of air distribution device is 30°, export sectional area is 0.5 to 0.6 m², airflow is stable, drag is small, and it contributes to reduce dust and gas and achieve better ventilation results.