In order to study the influence of groove ratio and width on the lubrication characteristics of waterlubricated stern tube bearing,based on the flexibility matrix method and lubrication theory,taking into the elastic deformation of the lining,fluidstructure interaction (FSI) model of the waterlubricated stern tube bearing with microgroove surface texture was established,and the correctness and rationality of the model was verified by experiments.The waterlubricated stern tube bearings with microgroove surface texture of three kinds of different crosssectional shapes,such as rectangular,circular and triangular,were designed.The influence of the groove area ratio and width on the bearing capacity and friction performance was analyzed.The results show that under the same conditions,the bearing capacity and friction performance of local groove stern bearing are significantly better than that of global groove stern bearing.When the groove area ratio is about 0.31,the bearing capacity of the rectangle grooved stern tube bearing reaches the maximum value and the friction coefficient reaches the minimum value.When designing and using water lubricated stern tube bearings,especially the thordon water lubricated stern tube bearings with rectangular microgroove,it is suggested that the ratio of groove should be 0.30 to 0.32 so as to obtain the best lubrication performance.With the increase of microgroove width,the lubrication effect of waterlubricated stern tube bearing with partial rectangle microgroove is significantly better than that of stern tube bearings with partial sosceles triangle and circular microgroove.