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To understand the engine maln bearings’ working condition is important in order to improve the performance of engine. However, thermal effects and thermal effect deformations of engine maln bearings are rarely considered simultaneously in most studies. A typical finite element model is selected and the effect of thermoelastohydrodynamic(TEHD) reaction on engine maln bearings is investigated. The calculated method of maln bearing’s thermal hydrodynamic reaction and joal misalignment effect is finite difference method, and its deformation reaction is calculated by using finite element method. The oil film pressure is solved numerically with Reynolds boundary conditions when various bearing characteristics are calculated. The whole model considers a temperature-pressure-viscosity relationship for the lubricant, surface roughness effect, and also an angular misalignment between the joal and the bearing. Numerical simulations of operation of a typical I6 diesel engine maln bearing is conducted and importance of several contributing factors in mixed lubrication is discussed. The performance characteristics of joal misaligned maln bearings under elastohydrodynamic(EHD) and TEHD loads of an I6 diesel engine are received, and then the joal center orbit movement, minimum oil film thickness and maximum oil film pressure of maln bearings are estimated over a wide range of engine operation. The model is verified through the comparison with other present models. The TEHD performance of engine maln bearings with various effects under the influences of joal misalignment is revealed, this is helpful to understand EHD and TEHD effect of misaligned engine maln bearings.