In　order　to　estimate　the　capacity　of　right-turn　lane　at　signalized　intersections　with　channelized　islands.　Based　on　the　gap　acceptance　model,　this　paper　proposes　a　new　approach　to　calculating　the　capacity　of　right-turn　lane　at　signalized　intersections　with　channelized　islands.　This　model　takes　into　account　the　interference　of　non-motorized　traffic　enter　channelized　islands.　The　non-motorized　traffic　is　treated　as　the　traffic　on　the　major　road-a　crosswalk,　which　has　great　impacts　on　right-turn　vehicles　on　the　minor　road-an　exclusive　right-turn　lane.　The　basic　model　is　modified　by　introducing　the　red　light　effect　adjustment　coefficient.　The　new　model　is　calibrated　and　tested　using　the　field　data　collected　at　6　signalized　intersections　with　channelized　islands　in　4　cities.　The　average　relative　error　between　the　calculated　value　and　the　observed　is　9.28%,　which　means　the　proposed　method　in　this　paper　can　better　estimate　the　capacity　of　an　exclusive　free　right-turn　lane　under　the　interference　of　non-motorized　traffic.