In　this　work　we　show　that　the　generating　N-photon　Greenberger-Horne-Zeilinger　entangled　state　protocol　proposed　by　Xia　et　al.　(Appl　Phys　Lett　92(1-3):021127,　2008)　which　can　be　realized　by　a　simpler　optical　setup　and　with　a　higher　success　probability.　The　present　protocol　setup　involves　simple　linear　optical　elements,　N　single-photon　superposition　states　and　conventional　photon　detectors.　This　makes　the　protocol　more　realizable　in　experiments.