Structural　response　modification　factor　implied　in　our　country＇s　current　aseismic　design　code　is　a　constant　R≈3.0.　Here,　to　assess　whether　or　not　the　chosen　value　of　structural　response　modification　factor　for　RC　frames　be　reasonable,　a　capacity-demand　ratio　λ　was　introduced.　17　RC　frames　with　different　stories　and　fortification　intensities　were　designed　according　to　our　country＇s　current　aseismic　design　code.　Based　on　the　finite　element　platform　OpenSees,　Pushover　analysis　method　was　used　to　analyze　these　frames＇　structural　anti-collapse　capacities,　and　obtain　capacity　values　of　their　structural　response　modification　factors　under　critical　collapse　state.The　static　capacity　spectrum　method　and　dynamic　capacity　spectrum　one　were　used　to　analyze　structure＇s　demand　under　rarely　occurred　earthquake,　and　obtain　demand　values　and　variation　laws　of　structural　response　modification　factors.Then,　the　capacity-demand　ratios　λ　was　obtained,　and　it　was　shown　that　its　value　always　is　larger　than　1.The　results　showed　that　RC　frames　designed　can　satisfy　the　expected　safety　performance　objective　against　collapse　under　rarely　occurred　earthquake;　response　modification　factors　of　structures　designed　according　to　8°　fortification　intensity　are　more　reasonable,　while　those　of　structures　designed　according　to　7°　fortification　intensity　are　more　conservative;　those　of　structures　designed　according　to　6°　fortification　intensity　are　too　conservative,　and　they　can　be　safely　increased.　©　2020,　Editorial　Office　of　Journal　of　Vibration　and　Shock.　All　right　reserved.