Threedimensional solid model of water lubricated hybrid stile cavity stern bearings with different cavity number and different cavity length was established.The finite element static analysis of the model was carried out by using ANSYS Workbench software to study the influence of number and length of the stile cavity on the mechanical properties of stern bearing.The results show that with the increasing of cavity number,the bearing stress concentration area is decreased,the change of stress and strain tends to be gentle,and the bearing displacement changes little,thus the mechanical properties and stability of stern bearing can be effectively improved by increasing the cavity number.Too big or too small cavity length will increase the bearing stress and strain and affect the mechanical properties of the bearing.The mechanical property is relatively stable for the six cavity stern bearing when the cavity length is between 420 mm and 460 mm