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In this paper, the k-ε turbulence model is usedto simulate the three-dimensional turbulence flow over thestepped spillway at the Yubeishan reservoir. In order to solvethe curved free water surface and to handle the complexboundary conditions, the fractional Volume Of Fluid (VOF)model that is applicable to the solution of the stratified two-phase flow is introduced along with k-ε turbulence model and the unstructured grid is used for the discretization of the irreg-ular simulation domain. By these methods, the turbulenceflow field of the stepped spillway is simulated successfully.The location of the free surface along the spillway, the magni-tude and distribution of the velocity, the pressure on the stepsurface, the turbulence kinetic energy and turbulence dissipa-tion rate are obtained by simulation. The changes and distri-butions of these characteristics along the width of the spillwayare also obtained. The energy dissipation ratio of the steppedspillway is calculated according to the upstream and down-stream water depth and velocities.