Abstract: Based on the two-phase homogenous flow of lubrication oil in bearing chamber,the paper solves three-dimension Navier-Stokes equations by the method of the turbulent model and Finite Differential Method(FDM).With the research of homogenous flow performance in the bearing chamber,lubrication oil flow field,pressure field and speed field are presented.The influence of shaft rotation speeds,air volume fraction and lubrication oil inlet speed on exit pressure and shear force between walls and lubrication oil was analyzed.The difference between single-phase flow and homogeneous flow model is illustrated in details.The results indicate that shaft rotation speeds,air volume fraction and lubrication oil inlet speed affects exit pressure and shear force differently.Some differences of calculation results can be seen from two different flow models and also proves the necessity of further research on two-phase flow in aero-engine bearing chamber.