There are some problems such as high flow velocity,structural cavitation and uneven discharge of lock chamber,because of the high-head and short delivery time,which have adverse effects on the safety of ships passing through the shiplock and the structure of the shiplock.The papper combines with the actual operation of the Three Gorges Shiplock,a new type of double-layer inertia-equilibrium filling-emptying system is proposed,which reduces the elevation of some galleries and diversion openings,forms the bottom filling-emptying gallery,and increases the layout area of shiplock floor outlet.Under the condition of increasing water delivery volume and maintaining water delivery time,it is possible to ensure the safety of the filling-emptying system structure and the uniformity of water flow conditions in the lock chamber.The RNG k -ε turbulence model is used to simulate the filling and discharging process of intermediate shiplock.The hydraulic characteristics such as flow rate,water level change of lock chamber,velocity and pressure distribution of filling-emptying system are analyzed.The research results prove the feasibility of double-layer inertia-equilibrium filling-emptying system which can provide technical reference for the design of filling-emptying system of high-head and abyssolith shiplock.