Stuning from the conclusions of the quantum theory of broadband StimulatedRarnan Forward Scattering(SRFS),this poper presents the principle of point correlation,by which the mechanism of improving the performance of broad-band Raman hamcombining with wave-guide is shown, and analyses the influence of the initial opticalparameters of pump beams and wave-guide on the efficiency of the beam-combining in usualRaman beam-combining scheme.After the analysis, a theoretical arrangement scheme ofbeam-combining is presented. Finally a discussion is given about the correctness of our conclusions from the latest Raman beam-combining results. It is believed that this principle can give a better explanation to the process of beam-combining with wave-guide.