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The desired outcome of flow characteristics from the model testing on spillway design process often can not be measured on the specific situation, but it is possible to obtain much of this information through numerical modeling. The flow characteristics in a whole spillway has been simulated based on the VOF method multidimensional two-phase flow model and standard k∼ɛ method by FLUNT software under the conditions of the checked flood level (650.39m) and the design flood level (653.36m). The numerical computation results of the surface elevation, pressure and flow velocity along the spillway in two schemes fit the experimental results well, and the difference of the average velocity between calculated and experiment results was less 6%. By model tests and numerical simulation, it found that the flow pattern and surface elevation of two holes scheme is complex caused by boundary conditions, but it is well after modifying to single hole. So the advanced CFD method is used to solve the design problems in a practical spillway design, and the calculation results can be used as the basis of the shape optimization.