Three-dimensional flow fields of submerged dams with four permeable rates(0. 1, 0. 2, 0. 3, and 0. 4)were numerically simulated based on the OpenFOAM open source package, and the influence of the permeable rate and discharge on the three-dimensional flow characteristics around permeable submerged dams was examined. The results show that, under constant discharge conditions, with the increase of the permeable rate, the reflux behind the dam is weakened; the upwelling height, the range of the slow-flow area, and the vorticity decrease; and the turbulent kinetic energy in the dam and near the permeable circular hole behind the dam increases. Under constant permeable rate conditions, with the increase of the discharge, the range of the slow-flow area behind the dam increases, the reflux is gradually weakened, the mixing is aggravated, and the vorticity and turbulent kinetic energy as well as their influence ranges increase.