本文针对目前大量应用的恒定流紊流数学模型必须给出流速的人流边界条件，而实际孔口泄流的入流流速和过流能力均未知的问题，通过调整入流流速，直至坝前距入口较远处满足静压分布的方法，得到孔口泄流能力和相应的入流速度。其结果与物理模型试验值基本一致。 In this paper, a large number of applications of constant flow turbulence mathematical model must be given flow velocity boundary conditions, but the actual orifice discharge inflow velocity and over-flow capacity are unknown problems, by adjusting the inflow velocity until the dam from the entrance of the more Far away to meet the static pressure distribution method to get the orifice discharge capacity and the corresponding inflow velocity. The results are basically consistent with the physical model test values.