Abstract: In order to study the elastohydrodynamic lubrication characteristics of power function non-Newtonian fluids under isothermal conditions，based on the Ostwald constitutive model，the non-Newtonian fluid lubrication problem was solved with the universal fluid lubrication equation． The effects of parameters such as rheological index，load，and entrainment velocity on the point contact EHL under isothermal and steady state conditions were discussed． A comparison between the non-Newtonian fluid and the Newtonian fluid was made． Then，the film thickness was measured by elastohydrodynamic lubrication experiment with a certain rheological index，and the effect of the entrainment velocity and the load on the film thickness was analyzed． The results show that when the non-Newtonian properties of the lubricant are more significant，the lubricant film will become less thick，and the pressure distribution will be closer to the Hertz contact stress distribution，and the influence of the load and the entrainment velocity on the lubricant film thickness pressure distribution of non-Newtonian fluids will be smaller than that on the Newtonian fluids． Under the same conditions，the film thickness of non-Newtonian fluid is smaller than that of the Newtonian fluid． From the comparison of the experimental measurement results with the numerical calculation results，it can be concluded that the effect of the entrainment velocity and load on the film thickness is basically consistent

Key words: non-Newtonian fluid, rheological index, point contact, entrainment velocity