Screen　content　like　cartoons,　captures　of　typical　computer　screens　or　video　with　text　overlay　or　news　ticker　is　an　important　category　of　video,　which　needs　new　techniques　beyond　the　existing　video　coding　techniques.　In　this　paper,　we　analyze　the　characteristics　of　screen　content　and　coding　efficiency　of　HEVC　on　screen　content.　We　propose　a　new　coding　scheme,　which　adopts　a　non-transform　representation,　separating　screen　content　into　color　component　and　structure　component.　Based　on　the　proposed　representation,　two　coding　modes　are　designed　for　screen　content　to　exploit　the　directional　correlation　and　non-translational　changes　in　screen　video　sequences.　The　proposed　scheme　is　then　seamlessly　incorporated　into　the　HEVC　structure　and　implemented　into　HEVC　range　extension　reference　software　HM9.0.　Experimental　results　show　that　the　proposed　scheme　achieves　up　to　52.6%　bitrate　saving　compared　with　HM9.0.　On　average,　35.1%,　29.2%　and　23.6%　bitrate　saving　are　achieved　with　intra,　random-access　and　low-delay　configurations,　respectively.　The　visual　quality　of　the　decoded　video　sequences　is　also　significantly　improved　by　reducing　ringing　artifacts　around　sharp　edges　and　reserving　the　shape　of　text　without　blur.