The shutting process of emergency ring gate was simulated through volume of fluids (VOF) method. The flow characteristics were calculated by the 3-D standard k-ε turbulence model. The flow characteristics include streamline motion, velocity distribution, and pressure distribution in the gate channel, gate flap channel and gate well, as well as dynamic water load on the gate. Curves of the hydraulic parameters vs. the opening of gate in the shutting process were obtained.The results provide basis for the design and operation of similar gate pattern.