Abstract: Accoding To the formula of effective pressure of air curtain as a door to cut off airflow, the air curtain with multi-parallel fans and its collocation was designed. The test was done in main conveyance tunnelands of a Mine of Ganshu Province. Testing results show that the air curtain can play a significant role like a door to cut airflow. Comparing with the door opening by worker, percentage of reducing the air flow-rate through the door reaches about 25 % . The Mine work conditions have been improved because the air curtain is propitious to increase percentage of effective wind volume. So, it can be widely used in other similar cases.