Region　Copy-Move　forgery,　in　which　a　part　of　the　image　is　copied　and　then　pasted　to　another　part　of　the　same　image.　Some　important　goals　and　sensitive　objects　can　be　hidden　imperceptibly;　this　forgery　is　at　the　rather　important　position　in　a　variety　of　forensic　technology　research.　But　the　literatures　published　merely　are　confined　without　geometric　distortion.　And　some　algorithms　focus　on　the　special　forgery＇s　model.　In　order　to　improve　the　accuracy　of　the　current　algorithms,　a　new　detection　is　proposed　by　constructing　the　circles　rather　than　the　traditional　ways　which　were　based　on　the　square.　The　seven　characterizes　are　constructed　according　to　singular　value　decomposition.　Using　main　rotation　angle　based　on　the　radial　moment　and　the　proportion　of　constraint　remove　the　error　mark.　Finally　the　dictionary-ordering　method　is　applied　to　save　the　time-consuming.　The　experiment　shows　that　this　newly　characteristic　can　locate　the　area　where　was　tampered.　©　2012　Springer-Verlag.