We　propose　a　two-party　quantum　private　comparison　protocol　using　single　photons,　in　which　two　distrustful　parties　can　compare　whether　their　secrets　are　equal　with　the　help　of　a　third　party　(TP).　Any　information　about　the　values　of　their　respective　secrets　will　not　be　leaked　out　even　with　a　compromised　TP.　Security　is　also　discussed.