In order to study the viscosity temperature characteristic of lubricating oils used in oil film bearing,the NDJ 5S digital viscometer was used to measure the viscosity of S220 oil,M220 oil,and H460 oil under normal pressure and the temperature ranging from 20 ℃ to 100 ℃.The viscosity temperature curves of the three oils were got,and the viscosity temperature formulae were obtained by fitting the viscosity temperature curves with power relationship and exponential relationship.It is shown through analyzing the fitting results that the power relationship as the viscosity temperature formula of the lubricating of oil film bearing is more consistent with the actual situation.