The characteristic of the bearing under thin film lubrication is far different to that of conventional calculation bearing. After that the affection of the gap of bearing on lubricant is considered, .the properties of lubricant will display great change. Because of this change, the characteristics of thin film lubrication are generally researched and recognized. An equivalent viscosity corrected model is applied to analyze characteristic of journal bearing in this paper. For infinite width bearing, an analysis equation on pressure distribution is gained. Then, the properties of journal bearing are calculated accurately.