Dynamic　characteristics　are　very　important　to　gas　foil　bearing　when　bearing-rotor　system　is　running　in　disturbance　statuses.　Three　types　of　disturbance　statuses　including　axial　whirl,　cylindrical　whirl　and　conical　whirl　are　introduced　in　this　paper,　and　axial　whirl　is　mainly　discussed　because　this　disturbance　condition　has　obvious　influence　for　dynamic　characteristics.　Based　on　the　governing　equations　represented　disturbance　condition,　dynamic　characteristics　including　stiffness　and　damping　coefficients　are　obtained　by　Finite　Difference　Method　(FDM).　The　results　show　that　dynamic　coefficients　in　axial　whirl　are　negative　numbers,　so　load　capacity　of　foil　thrust　bearing　will　decrease　when　axial　whirl　takes　place;　generally,　absolute　values　of　the　dynamic　coefficients　are　increase　when　structural　stiffness　and　damping　increase;　absolute　values　of　the　dynamic　coefficients　become　bigger　when　ramp　ratio　decreases　and　bearing　number　increase.　In　order　to　reduce　the　influence　of　disturbance　statuses,　the　foil　thrust　bearings　should　have　high　ramp　ratio　and　low　bearing　number.