The Raman gain separated fiber is designated. The analytic solutions of N-channels stimulated Raman scattering (SRS) steady-state coupling wave equation in the fibers is given. As considering the SRS cross coupling among the N-channels, the analytic solutions are applicable to arbitrary channel separation and input photon fluxes. These results can be used to analyze and design the optical fiber communication systems, Raman fiber amplifier and lasers. Finally, the analytic solution is compared with numerical one, both are in very good agreement.