In this paper, the influence of hydrothermal environment on the composite laminate plate with a hole is studied by experiment method. The test setup is design for prevent the bucking of the plate specimen, which is composed two main parts. The slide part limits the movement of the specimen along the load direction. Three types of ply stack composite laminate plate are tested. Results show that the strength of all the type of laminate plate in the hydrothermal environment reduces on the contrast to the room temperature and dry environment. But the reduction relatives the ply stack of laminate plate. [45/0/-45/90]2S plate reduces smallest. [45/0/02/45/90/-45/0/45/902/-45/0]S plate reduces most.