Earthquake　resistant　capability　of　concrete　arch　bridge　with　steel　truss　webs　is　analyzed.　Taking　a　reinforced-concrete　arch　bridge　as　a　prototype,　the　seismic　response　analysis　of　concrete　arch　bridge　with　steel　truss　webs　subjected　to　three-directional　ground　motions　is　carried　out　by　using　the　time-history　analysis　method.　The　results　show　that,　compared　with　the　reinforced-concrete　arch　bridge,　the　out-plane　basic　frequency　of　this　new　arch　structure　reduce　45%　and　in-plane　basic　frequency　reduce　18~26%.　Simultaneously,　the　inforce　seismic　response　in　transverse　direction　reduce　50%　and　also　bending　moment　and　thrust　seismic　response　in　longitudinal　direction　reduce　30%　and　17%　respectively.　It　would　play　a　role　in　resisting　vertical　ground　motion　when　web　using　steel　truss　instead　of　concrete.　Concrete　arch　bridge　with　steel　truss　webs　has　a　better　earthquake　resistance　performance.