The static characteristic of the infinite wide hydrodynamic journal bearing was investigated theoretically assumed that the laminar flow and turbulent regimes,so-called coexistence flow state,existed simultaneously in the oil film.Based on the lubrication theory of two flow regimes,by solving the coupling governing equations of bearing such as Reynolds equation,energy equation and temperature viscosity equation,the changes of flow regimes in the oil film were analyzed and the pressure,carrying-capacity,friction and maximum temperature fields were obtained.The results show that,there is a complex process for the fluid transition from pure laminar flow regime to pure turbulent flow regime in the oil film along with the increasing of shaft rotation speed and eccentricity.Compared with pure laminar flow state,bigger load carrying capacity and friction,higher temperature rise and bigger viscosity change of the fluid are found under coexistence state,indicating that the influence on the bearing static lubrication characteristics by the change of flow regimes and the thermal effect can not be ignored,the flow regimes of oil film should be accurately judged and the thermal effect should be taken into account when calculating the bearing characteristics.