Abstract: The wall slip analysis of two-dimensional and complex flow is seldom. According to the different structure of the spiral oil wedge journal bearing that can produce the two-dimensional circumferential and axial flow, the modified Reynolds equation is established based on the critical shear stress model, in which circumferential and axial wall slip of the sleeve and axial surface is considered, and the model is proved by theory and experiment. In experiment, circumferential and axial wall slip is proved by the method of target speed tracking method, slip velocity increases with the increase of input pressure, and the critical shear stresses of sleeve and axis surface are obtained. In theory, by means of the finite differential methods and the critical shear stresses of sleeve and axis surface that are obtained in experiment, the four modified Reynolds equations are solved. It is obtained that the wall slip occurs first in the large shear stresses, the small clearance and the envelop zone by the theory model. Wall slip can decrease the carrying capacity and friction. Eccentricity, spiral angle and rotating speed have effects on the reduction magnitude of the capacity and friction.

Key words: Critical shear stress, Lubrication, Spiral oil wedge, Wall slip