Abstract: Oil cavity’s carrying capacity under inlet Reynolds numbers in 840 ~ 2449 were investigated based on experiment and numerical simulation.The oil cavity flow fields under inlet Reynolds numbers observed by PIV meet well with numerical simulation results which cover oil cavity’s wall pressure and wall shearing stress.With the inlet Reynolds numbers increasing,the vortex position is near the oil sealing edge and the vortex becomes larger.There is a function relationship between vortex center position and inlet Reynolds numbers.A peak of wall pressure generated by inlet jet appears on the center of oil cavity’s upper wall,and then after the peak wall pressure distribute even as a constant.The peak of wall shearing stress at the edge of upper wall opposite to inlet may lead to the oil film rupture.