Fixture is an important tool in the manufacturing process of industrial production,plays a very important role in production.Among them,hydraulic fixture because of its fast clamping speed,low labour intensity of workers,in the production process of the fixture used in the proportion of more and more high.Based on this,the company will be combined with a product of the fixture improvement to the hydraulic fixture and the design of the key structure to explore,the commissioning and use of the new fixture to prove that the production efficiency increased by 40%,improve the service life of the positioning element.