By　means　of　density　functional　theory,　N-doping　concentration　effects　on　graphene　and　alone　Pt　atom　adsorption　on　N-doping　graphene　with　various　N-doping　concentrations　have　been　investigated.　We　found　that　N　dopant　atoms　tended　to　be　distributed　in　para　positions　and　alone　Pt　atom　was　always　adsorbed　in　the　upside　of　C-C　bridge　site　around　the　N　dopant　atoms.　Furthermore,　we　inferred　that　N-doped　graphene　with　dosage　concentration　higher　than　8/32　would　be　hard　to　be　prepared.　In　addition,　the　enhancement　of　Pt　6s　and　C　2p　orbital　bonding　interaction　improved　the　ability　of　Pt　atom　adsorption　on　N-doped　graphene.　(C)　2013　Elsevier　B.V.　All　rights　reserved.