Mixed lubrication is the main lubrication state of typical parts.According to different surface roughness characterization methods,mixed lubrication models are generally classified into two categories,one is statistical model,and the other is deterministic model.In order to study the difference between the two models in solving the point contact mixed lubrication of rough surface,the statistical model based on the average flow model and the GW model and the deterministic model based on the unified Reynolds equation were adopted to predict the oil film thickness and the asperity load ratio under different surface roughness,rolling speed,load and environmental viscosity of lubricating oil,and the consistency between the two models was compared.The results show that with the increase of roughness,the difference of asperity load ratio between the two models becomes larger.With the increase of rolling speed or environmental viscosity,the difference of film thickness between the two models becomes larger.The consistency between the oil film thickness and the asperity load ratio of the two models under low load is better than that under high load.