In　this　paper,　we　study　the　permanence,　extinction　and　periodic　solution　of　the　periodic　predator-prey　system　with　Beddington-DeAngelis　functional　response　and　stage　structure　for　prey.　A　set　of　sufficient　and　necessary　conditions　which　guarantee　the　predator　and　prey　species　to　be　permanent　are　obtained.　In　addition,　sufficient　conditions　are　derived　for　the　existence　of　positive　periodic　solutions　to　the　system.　Numeric　simulations　show　the　feasibility　of　the　main　results.　(c)　2006　Published　by　Elsevier　Ltd.