By　considering　the　increasing　importance　of　screen　contents,　the　high　efficiency　video　coding　(HEVC)　standard　includes　screen　content　coding　as　one　of　its　requirements.　In　this　paper,　we　demonstrate　that　enabling　frame　level　block　searching　in　HEVC　can　significantly　improve　coding　efficiency　on　screen　contents.　We　propose　a　hash-based　block　matching　scheme　for　the　intra　block　copy　mode　and　the　motion　estimation　process,　which　enables　frame　level　block　searching　in　HEVC　without　changing　the　HEVC　syntaxes.　In　the　proposed　scheme,　the　blocks　sharing　the　same　hash　values　with　the　current　block　are　selected　as　prediction　candidates.　Then　the　hash-based　block　selection　is　employed　to　select　the　best　candidates.　To　achieve　the　best　coding　efficiency,　the　rate　distortion　optimization　is　further　employed　to　improve　the　proposed　scheme　by　balancing　the　coding　cost　of　motion　vectors　and　prediction　difference.　Compared　with　HEVC,　the　proposed　scheme　achieves　21%　and　37%　bitrate　saving　with　all　intra　and　low　delay　configurations　with　encoding　time　reduction.　Up　to　59%　bitrate　saving　can　be　achieved　on　sequences　with　large　motions.