An　efficient　quantum　key　distribution　(QKD)　protocol　with　orthogonal　product　states　in　the　3　circle　times　3　Hilbert　space　is　presented.　The　sender,　Alice,　disorders　the　orthogonal　product　state　sequence　and　sends　it　to　Bob.　After　Alice　has　published　the　matching　information　of　the　particle　sequence,　Bob　recovers　the　correct　correspondences　and　makes　an　orthogonal　measurement　on　the　orthogonal　product　states　to　obtain　the　information　sent　by　Alice.　Finally,　security　analysis　is　also　made.