After　analyzing　the　main　quantum　private　comparison　(QPC)　protocols　based　on　the　entanglement　states,　we　propose　a　new　QPC　protocol　using　only　polarized　single　photons.　It　will　be　shown　that　entanglement　is　not　necessary　for　QPC.　Most　importantly,　it　will　be　pointed　out　that　QPC　protocols　can　be　constructed　by　adapting　the　current　quantum　three-party　secret　sharing　models　properly.