Abstract: Thesine-vibration-data-basedmodelupdatingmethodplaysanimportantrolein  improvingthefiniteelementmodelinglevelinspacecraftengineering. The  key  to  sine-vibration-data-based  modelupdatingmethodisthecoherenceofthemodalfrequenciesandtheresponsecurvesofthemodelbefore&afterupdated.  Firstly,theanalysismethodofthestructureresponsewasderivedbasedonthebaseexcitation.Secondly,theupdatingmethodwasstudiedintwosteps,whichmakesthemodalfrequenciesandtheresponsecurvesoftheanalysismodelconsistentwiththatofthetestmodel.Finally,theGARTUREtrussmodelwasusedtovalidatethetwostepupdatingmethod.Theresultsshowthatthefundamentalfrequenciesoftheanalysismodelagreewiththetestmodel,thefirsttenmodalfrequencyerrorisunder0.15%,andtheresponsepeakerrorofthetypicalpointsislessthan1%.

Key words: Sinevibrationtest, Modelupdating, Baseexcitation, Modalfrequency, Responsepeak, Spacecraftstructure