Based on the flexible engine body and the flexible crankshaft,the thermal elastohydrodynamic(TEHD) hybrid lubrication model for the main bearing with the coupling between the marine diesel engine body and the crankshaft was established by using the extended Reynolds equation under JFO boundary conditions and the Greenwood/Tripp micropeak contact theory,and taking into account the influence of temperature on friction lubrication.The model was compared with different computation models and verified by ALLMAIER method.The results show that under the thermal elasto hydrodynamic hybrid lubrication model,the calculation results of the single bearing model are conservative,and the whole body model is more reasonable.While under the fully flexible integral body model,THD model is too ideal,the EHD model which considers the effect of constant temperature has larger friction power consumption than TEHD model,which indicates that the influence of temperature on oil film plays an important role in the friction characteristics of the main bearing.Thus,the thermal elastohydrodynamic hybrid lubrication model with full flexibility parts and considering the influence of surface contact and temperature on oil film and friction pair is an appropriate choice for large marine diesel engines.