Inverted V-shaped stepped spillway is a new shaped stepped spillway, which has unique flow characteristics. In order to study the unique flow field characteristics of inverted V-shaped stepped spillway, a comparison study on flow velocity distribution, pressure distribution and energy dissipation characteristics was made by numerical simulation between the inverted V-shaped and traditional stepped spillways, based on the model test research. The result shows that the flow structure and the pressure distribution between inverted V-shaped and traditional stepped spillways are quite different，these distributions have obvious differences along the cross section with unique three dimensional characteristics. It has better energy dissipation rates in inverted V-shaped stepped spillway than that of in traditional stepped spillway.