Abstract: Deep rock mass deformation monitoring of TGP’S double-line five-grade ship lock shows that the rock mass vertical deformation, caused by the ship lock excavation, presents rebound, the maximum rebound deformation is 10.39 mm；horizontal displacement moves to the ship lock chamber, the maximum deformation is 26.14 mm. With the end of excavation the deformation approximately trends to be stable, and at present the deep rock mass of high slope is in the steady condition.