Abstract: The method to establish the continuous nonlinear oil-film force database of hydrodynamic journal bearing including the inlet pressure boundary condition was developed making use of nonlinear transformations of Reynolds equations, which contributed to extending the application fields of the database method to compute nonlinear oil-film forces of finite-length journal bearings. The continuous nonlinear oil-film force database and the calculation models with better conformity to practical working conditions were established by introducing two new parameters with finite ranges to realize the finite treatment of the rotor axes velocity and the inlet pressure boundary condition. Finite element method (FEM) and the established database method were comparatively employed to calculate the oil-film forces of an elliptical bearing at any movement states of the axes. It was found that the results based on the database method were almost identical to that based on the FEM solutions. Thus the established nonlinear oil-film force database was applicable to analyzing the transient movement of a rotor system with convenience and good precision.