This　paper　presents　the　dynamic　analysis　of　a　flexure-based　compliant　stage.　The　dynamic　model　is　first　obtained,　after　which　the　equivalent　masses　of　the　flexure　hinge,　including　the　axial　equivalent　mass,　the　bending　equivalent　mass,　and　the　shear　equivalent　mass,　are　derived.　According　to　this　method,　the　equivalent　mass　components　of　the　proposed　stage　are　derived　by　accumulating　those　of　the　output　platform,　input　platform,　and　flexure　hinges.　Finally,　to　verify　the　validity　of　the　proposed　method,　the　first　two　resonant　frequencies　and　the　corresponding　mode　shapes　are　analyzed　by　using　finite　element　analysis　(FEA).　An　experimental　platform　is　fabricated,　and　experimental　results　and　FEA　values　appear　to　be　in　accordance　with　the　theoretical　calculations.　This　result　demonstrates　that　the　dynamic　model　and　equivalent　mass　are　accurate.　The　dynamic　model　provides　an　effective　method　for　calculating　equivalent　masses,　and　dynamic　characteristics　can　be　precisely　estimated　from　the　corresponding　analytical　models.