A numerical model of friction surfaces with surface texturing in full film lubrication was established with the Reynolds equation as the theoretical basis of the model and based on a pin on disc test and finite difference method. The effect of surface texturing parameters on pressure distribution of the oil film between the friction surfaces was analyzed. The results show that hydrodynamic lubrication is produced in the friction surface of pin and disc pairs under the condition of the established model, and the surface texturing parameters influence the oil film pressure distribution in the pin and disc surface. The optimized surface texturing parameters that the higher average pressure of oil film can be realized were obtained, which can be used to determine the optimized parameter range of surface texture for pin on disc test of artificial hip joint materials.