Abstract- Hydrodynamic journal bearings are used in machinery which is rotating at high speeds and heavy loads for work done. This results in increase temperature rise in the lubricant film which significantly affects off the bearing. The thermo-hydrodynamic analysis should be carried out in order to obtain the realistic performance parameters of the journal bearing. Journal bearing models are developed for different speeds and eccentricity ratios to study the interaction between the fluid and elastic behavior of the bearing. Thermo-hydrodynamic analysis of circular journal bearing has been simulated by using Computational Fluid Dynamics approach. This approach solves the three-dimensional Navier-stokes equation to predict the bearing performance parameters such as the pressure and temperature of the lubricant along the profile of the bearing. The CFD technique has been applied through ANSYS Fluent software. The oil flow is assumed to be laminar and the steady state condition has been assumed in the current work. The effect of variation of pressure and temperature are considered during the study. Journal bearing models are developed for different speeds and eccentricity ratios to study the interaction between the fluid and elastic behavior of the bearing. By applied the fins on journal bearing we improved the efficiency of journal bearing