In order to realize the active control of the bearing capacity of the air bearing,an active control slit throttling air bearing was designed,which can adjust the bearing capacity of air bearing by adjusting the throttle area of the slot.The CFD model of air bearing was established,and the influence of the air supply pressure,radial slit height and air film thickness on the bearing capacity of air bearing was studied by using dynamic mesh technology.The results show that the dynamic adjustment of bearing capacity can be realized by actively adjusting the restrictor area of the slit.Increasing the restrictor area of the slit can increase the range of bearing capacity,and increasing the air supply pressure,radial slit height and air film thickness can improve the static bearing capacity of the air bearing.The designed active slit control structure can realize the dynamic adjustment of the bearing performance of the air bearing,which lays a theoretical foundation for the application and development of the active control of the air bearing in the future.