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On thefemtosecondpulse transmissionin silicon waveguidesandsupercontinuum generationare studiedby using the nonlinear Schrodinger equation,calculation andAnalysis on the influence ofprocessparameters andnonlineardispersionlossinsupercontinuumin. The results show that,the soliton splittingis the mainmechanism ofsupercontinuumin silicon waveguidesfemtosecond pulse.Greatinfluence ofrelative position offemtosecond pulsecentral wavelengthand waveguidezero dispersionpointon supercontinuum.When theanomalous dispersion region ofcenter wavelengthis locatednearthe zero dispersion,soliton splitthe most obviousphenomenon,spectrum widthis much larger thanthezero dispersion wavelengthandnormal dispersionat theincidencesituation,andreach steadybroadeningrequiredwaveguidethe length of the shortest.Secondly,the high order dispersionsizewill also affect thespectral broadening,threeorder dispersionabsolutevalue is small,can obtain largerbroadening.In addition,thetwo-photon absorption effectto bring a lot ofloss,limiting thespectral width,and with theinitial pulsepowerincreases gradually,broadeningsaturated.