Based on the global Newton-Raphaon method and the flexibility matrix method,the lubrication performance of high power density diesel engine connecting-rod big-end bearing was numerically studied.Based on mass conserving boundary condition,the Reynolds equation and elastic deformation equation were solved.The orbit and the pressure distribution between the elastic bearing and the rigid bearing were compared.The results show that the global Newton-Raphaon method combined with flexibility matrix method solves the problem of difficult convergence of the elastohydrodynamic lubrication calculation as the bearing eccentricity is greater than 1 when used to analyze the elastohydrodynamic lubrication of engine connecting-rod big-end bearings under the high power density.Compared with the rigid bearing,the shape oil film pressure distribution and the size of oil film pressure of the elastic bearing are changed obviously near the maximum gas explosive pressure,especially in the two ends of the bearing,the oil film pressure is increased obviously and is close to the pressure in the middle part of bearing.