Much　work　is　needed　to　for　a　further　study　on　the　dynamic　analysis　and　design　of　fully　compliant　mechanisms　to　improve　their　performance　and　operational　accuracy.　In　order　to　give　attention　to　the　rotation　range　and　operation　accuracy,　elliptical　flexure　hinge　is　studied　in　this　paper.　An　integral　equation　for　elliptical　flexure　hinge　is　derived　by　introducing　centrifugal　angle　as　the　integral　variable.　Defining　an　intermediate　parameter　in　the　integral　equation,　the　stiffness　of　elliptical　flexure　hinge　is　presented.　Then　the　dynamic　model　is　proposed　to　predict　the　fundamental　natural　frequency　of　fully　compliant　mechanism.　The　results　of　example　indicate　that　design　parameters　have　an　impact　on　the　stiffness　of　elliptical　flexure　hinge　and　the　frequency　characteristics　of　fully　compliant　mechanism.　The　proposed　method　is　convenient　for　analyzing　stiffness　of　elliptical　flexure　hinge　and　frequency　characteristics　of　fully　compliant　mechanisms.