Abstract:The aerostatic bearing has the phenomenon that the pressure of the orifice exit will be drastically reduce in certain conditions, and it reduces the capacity and stiffness of the bearing. When highspeed airflow shot out from the orifice, it will turn 90 degrees quickly because of the plane bar, which makes the airflow speed further improved at the corner and leads to the lower pressure. In order to improve the static characteristics of aerostatic bearing, at the same time considering the processing performance of hydrostatic bearing, the method is put forward of processing the slope in orifice to suppress the drastic pressure depression phenomenon. The low Reynolds number Kε turbulence model of singlearch thrust bearing was first established. And the steep fall ratio, loadbearing characteristics and gas consumption were analyzed in the bearing pressure equalizing area with the different angles on the basis of the CFD simulation. The conclusion are obtained as follows: the orifice exit ramp angle can obviously supress drastic pressure depression phenomenon; when the orifice exit ramp angle is less than 6 degrees, the greater the angle, the smaller is the steep fall ratio of the loading pressure; with increasing of the ramp angle, the greater the bearing capacity, the greater is the gas consumption at the same time.