In　order　to　investigate　the　differences　between　section　forms　of　frame　beam　in　realization　of　strong　column　and　weak　beam,　two　frame　structures　with　beam　section　forms　of　ordinary　beam　and　flat　beam　are　simulated　in　ABAQUS.　Via　the　comparison　of　base　shear　,　reinforcement　stress　of　beam　,　column　and　slab　,　crack　development　between　the　two　models　,　similarities　and　diiferences　are　investigated.　Moreover　,　the　influence　of　beam　section　form　on　participation　of　slab　reinforcement　in　resistance　to　bending　moment　of　frame　beam　is　studied.　The　result　shows　ha　heframes　ruc　urewi　hfla　beamsec　ioncanac　ualizes　rongcolumnandweakbeamprinciplebe　er　han　ha　with　ordinary　beam;　the　frame　beam　connected　with　two　sides　of　slab　can　actualize　strong　column　and　weak　beam　principle　better　than　that　connected　with　just　one　side　of　slab;　a　frame　structure　which　is　similar　with　models　in　this　paper　,　the　effective　flange　width　can　be　taken　as　900mm　for　ordinary　beam　and　1100mm　for　flat　beam　in　RC　frame　structure.