The miter gate is one of the important equipments of the Three Gorges ship lock.It has a high frequency of operation and accelerates the occurrence of the bottom hinge failure rate.It must be periodically lifted for bottom hinge inspection and repair.Currently,the miter gate’s overhaul is usually implemented during the planned shutdown.The high-position lifting of the miter gate overhaul needs to demolish the top hinge and opening and closing mechanism,and fix the miter gate,which is suitable for the planned overhaul project with long construction period. Aiming at the sudden failures that may exist in the daily operation of the bottom hinge of the miter gate,we propose the overhaul plan of using the bottom hinge removal equipment and the supporting tooling to implement the bottom hinge removal without removing the top hinge.The research result proves that the scheme of low-position lifting of the miter gate for the overhaul of the bottom hinge is feasible,and it provides an alternative for the lifting miter gate overhaul of the Three Gorges ship lock.