By optimizing the operation of the filling and emptying valve of a high-head lock，the berthing conditions of ships in the lock chamber and the flow conditions of the valve section of the water-delivery corridor can be improved.This is an essential technical means to solve the problem that the mooring force exceeds the designed value due to the large size of the ship passing the lock.Combined with the operation status of the filling and emptying valve of a large ship lock through adjusting the opening of the dynamic water closing (opening)valve，the residual head of the dynamic water shutoff valve under different working conditions of the filling and emptying valve operation process and the hydraulic field test，the optimized operation process of the water filling valve with the water filling and discharging time and inertia superelevation(drop)meeting the design and specification requirements is selected.The field test shows that the recommended operation process of the water conveyance valve can effectively improve the berthing conditions of the ship in the lock chamber and the hydraulic conditions of the water conveyance corridor.The maximum mooring force of the ship during bilateral water filling is 39.3% lower than the current working condition.When the miter door is opened，the maximum mooring force of the ship is reduced by nearly 59% compared with the current working condition.