The comparison among results simulated by performing the coarse-resolution LICOM model over the global ocean with the turbulence mixing scheme of Canuto et al. (T-scheme for short) adding the inertial internal wave breaking mixing scheme (F-scheme for short) put forward by Fan et al. recently, those simulated with T-scheme alone, and the WOA09 data, demonstrates that a notable improvement of modeling the North Pacific Intermediate Water (NPIW) has been attained by using Fscheme,which illustrates the robustness and effectiveness of F-scheme. The inertial internal wave breaking mixing may be one of important mechanisms maintaining the ventilation process, as well as inertial forcing of wind may be an external mechanical source of mixing in the ocean interior. The obvious seasonal variability of NPIW occurs in both the observations (WOA09) and the simulation results,which implies that NPIW plays an important role in climate changes besides the surface water and Mode water. Finally analysis of the simulation results indicates that to achieve further progress of modeling NPIW the high-resolution ocean model and the parameterization scheme of fronts and filaments are necessary.