Rubber-plastic double-layer composite material water-lubricated bearing combines the characteristics of good damping property of rubber and great friction performance of plastic,and is a new kind of well promising water-lubricated bearing.However,its lubrication and load-bearing mechanism is not clear.The characteristics and law of bearing bush deformation at different load,bearing bush thickness and elastic modulus were studied using fluid-structure interaction simulation method.Results show that the deformation of bearing bush mainly occurs in the rubber layer.The deformation of rubber bush affects the shape of plastic bush and makes it move as a whole.With the increase of load,the bearing bush deformation increases and the stiffness coefficient decreases.With the increase of plastic bush thickness,the bearing bush total deformation decreases approximately linearly,and the stiffness coefficient increases.While the change in the elastic modulus of the plastic bush has a relatively small impact on the total deformation and stiffness coefficient of the bearing bush.