In　this　paper　an　efficient　quantum　secure　direct　communication　(QSDC)　scheme　with　authentication　is　presented,　which　is　based　on　quantum　entanglement　and　polarized　single　photons.　The　present　protocol　uses　Einstein-Podolsky　Rosen　(EPR)　pairs　and　polarized　single　photons　in　batches.　A　particle　of　the　EPR　pairs　is　retained　in　the　sender＇s　station,　and　the　other　is　transmitted　forth　and　back　between　the　sender　and　the　receiver,　similar　to　the　＇ping-pong＇　QSDC　protocol.　According　to　the　shared　information　beforehand,　these　two　kinds　of　quantum　states　are　mixed　and　then　transmitted　via　a　quantum　channel.　The　EPR　pairs　are　used　to　transmit　secret　messages　and　the　polarized　single　photons　used　for　authentication　and　eavesdropping　check.　Consequently,　because　of　the　dual　contributions　of　the　polarized　single　photons,　no　classical　information　is　needed.　The　intrinsic　efficiency　and　total　efficiency　are　both　1　in　this　scheme　as　almost　all　of　the　instances　are　useful　and　each　EPR　pair　can　be　used　to　carry　two　bits　of　information.