The traditional three-oil wedge bearing has a fixed structure shape and a single operating condition,in order to adapt to the changing working conditions,a variable and controllable three-oil wedge bearing was proposed.The piezoelectric stack is introduced into the bearing structure,and the piezoelectric stack generates a driving force under the action of DC drive voltage,so that the inner surface of the bearing changes from a round to a three-oil wedge shape,and the bearing deformation can be controlled by changing the voltage.The structure and working principle of the bearing were introduced,CREO software was used to establish the geometric model of the oil film under different driving voltages and the model was imported into the pretreatment software icem for structured meshing.The static characteristics of the bearing under different voltages,eccentricities and speeds were calculated and analyzed based on the two-phase flow model in fluent software.The results show that changing the driving voltage can change the oil film clearance of the three-oil wedge bearing,and then adjust the oil film pressure distribution and static characteristics.At the same speed and eccentricity,with the increase of the driving voltage,the deformation of the variable three oil wedge bearing increases,the bearing capacity and friction force gradually decrease,and the flow rate gradually increases.