The construction of the ship lock lifting miter gate in high position needs to install fixture of miter gate,and the traditional installation of fixture is complex and the security is poor.In terms of the existing conditions and defects of the fixture,we carried out the design study of the new fixture of the lifting miter gate for the Three Gorges ship lock and Gezhou ship lock,and applied it to the engineering practice.The installation of the optimized fixture of miter gate is simple,safe and reliable,and can effectively save construction time and space,reduce construction cost,and propose the further optimization ideas according to the application situation.