Abstract: When the width of the lock chamber of integral ship lock is large,it is necessary to arrange filling and emptying system on the left and right independently.The classical left and right independent filling and emptying system in the code is suitable for the ship lock of lower water head.If it is applied to the ship lock with middle and high water head,the indoor berthing condition of the lock is poor,and the mooring force is difficult to meet the requirements of the code.Taking Gushan navigation lock as an example,whose chamber plane dimension is 120.0 m×23.0 m×3.0 m and water head is nearly 20 m,this paper introduces the innovative design scheme for the layout of the filling and emptying system suitable for the integrated lock chamber structure.Through analogy analysis,numerical simulation and model test,the finalized balanced flow system of four longitudinal gallery,two sections of self-splitting sluice chamber and valve operation mode was determined,which can solve the problem that the berthing conditions in the lock chamber is poor when the left and right independent filling and emptying system is adopted.Relevant experience can be used as a reference for design of similar middle and high water head ship lock.