Abstract: This paper analysed the properties of hydrodynamic loads acting on gate structures,points out types and characteristics of gate vibration, and emphasizes damage of special hydrodynamic loads such as cavitation flow etc. to gate vibration, In the paper ways are also discussed of improving flow boundary conditions and increasing suitable added measures to decrease or avoid hydrodynamic loads. In addition, effects of avoiding flow high energy areas and controlling strong gate vibration by use of structural dynamic optimization method are expounded. Finally dynamic stability of the gate was also discussed in the paper.