Three　different　type　CFST　arch　bridges　with　cross　section　of　single　tubular,　dumbbell　shape　and　truss　are　taken　as　case　study　to　build　FEM　model.　The　analysis　of　the　effect　to　inner　force　and　deform　by　construction　error　of　pier　are　carried　out.　The　research　results　shown　that　error　of　pier　has　little　effect　to　thrust　and　deform　of　arch　rib　but　has　major　effect　to　bending　moment.　The　limit　of　construction　error　of　pier　in　present　bridge　construction　code　is　independent　of　arch　span　and　the　limit　of　10　mm　is　strict　for　CFST　arch　bridge.　The　suggestion　was　proposed　that　this　limit　could　be　liberalized　to　1/5000　of　span.