Abstract: Abstract: In order to solve the problem of dust pollution in fully mechanized face, based on the theory of jet ventilation, this paper analyzes the basic principle of pressure wind shunting and sectionally control airflow to control dust, and put forward the existence of dust control surface,and based on the principle that the axial and radial outflow and the distance between the outlet and the working face coal wall must meet the minimum wind speed requirement, and established mathematical model, and revealed the relationship between the axial and radial outflow and the distance between the outlet and the outlet, and obtained the best matching relation of the key parameters of sectionally control airflow to control dust, and carry out application verification at the scene. The field application shows that according to the parameters of the air-control and dust-control system deduced from the theory, the dust concentration and dust-control efficiency of each point in the working face can be increased by more than 95%, and the overall dust-control efficiency can reach more than 98.4%. The high-concentration dust can be controlled in a certain area in the front of the working face, and the dust in the working personnel area can be controlled within 30 mg/m3. The dust control effect is remarkable, and the working environment is obviously improved, which verifies the validity of matching parameters.