Through　the　finite　element　simulation　to　study　the　local　stability　of　the　circle-castellated　beams,　reasonable　finite　element　model　was　established　using　finite　element　software　and　in-depth　analysis　of　the　local　stability　of　the　circle-castellated　beams　on　the　basis　of　the　castellated　beams　shear　performance　test.　The　same　span　of　the　circle-castellated　beams,　deformation　stability　performance　under　two　point　loads　simulation,　got　deformation　form　of　castellated　beams　under　different　pitch　of　holes,　opening　ratio,　stiffener　thickness,　depth-thickness　ratio.　The　local　stability　properties　of　the　same　span　of　the　circle-castellated　beams　are　directly　related　to　opening　ratio　and　web　depth-thickness　ratio　changes,　which　has　little　effect　with　the　change　of　hole　spacing,　stiffener　thickness.　Using　the　appropriate　opening　ratio,　web　depth-thickness　ratio　plays　an　important　role　on　improving　the　local　stability　of　web　under　the　shear　force　and　the　bending　moment.　©　(2013)　Trans　Tech　Publications,　Switzerland.