We use general finite element software ANSYS to simulate viscoelastic artificial boundary calculation program.The feasibility of the program is verified by an example.The dynamic calculation model of chamber structure is established based on the calculation model.Under conditions of fixed boundary and viscoelastic artificial boundary,dynamic calculation of different boundary range is programmed.The results show:compared with fixed boundary,viscoelastic artificial boundary is more reliable.Under the action of earthquake,acceleration response is most obvious at the top of the lock wall.The maximum value of the tension stress response is in the bottom of the lock wall.The stress in the bottom of the ship lock appears as tension stress in downside,and the maximum tensile stress value in lock bottom is larger than that in the lock wall.The structural responses to stabilize when the boundary range takes 2～3 times the size of the lock bottom.