In　this　paper,　beam　ends　of　beam-slab-column　joints　installed　in　reinforced　concrete　structures　are　simulated　using　ABAQUS　FEM　analysis　software.　The　simulation　work　is　carried　out　under　the　monotonic　loading.　The　damage　factor　in　the　plastic-damage　model　is　adopted　for　describing　the　damage　state　of　concrete.　The　failure　characteristics,　the　distribution　of　cracks　on　the　top　side　of　slab　are　discussed　according　to　the　simulation　results.　The　stresses　of　longitudinal　bars　in　the　slab　along　with　different　distances　between　the　longitudinal　bar　and　the　beam　are　given.　In　reliability　assessment　of　the　numerical　model,　the　effects　of　slab　thickness　and　slab　reinforcement　ratio　on　flexural　behavior　of　beam-slab　cooperative　working　are　conducted　further　more.