The　binding　strength　of　coinage　metal　(IB　group)　single　and　double　atoms　clusters　on　perfect　or　N-doped　graphene　has　been　studied　with　the　periodic　slab　model　using　generalized　gradient　approximation　(GGA).　The　calculated　results　indicated　that　N-doped　graphene　showed　metallic　electron　properties　rather　than　semimetallic　ones　of　perfect　graphene.　Physical　or　weak　chemical　adsorption　was　got　on　perfect　or　graphite　N-doped　graphene　with　the　binding　energy　around　0.5　eV.　Chemical　adsorption　happened　on　pyridine　N-doped　graphene　and　pyrrole　N-doped　graphene　with　binding　energy　above　1　eV.　Pyrrole　N-doped　graphene　was　less　stable　than　graphite　N-doped　graphene　or　pyridine　N-doped　graphene.　When　adsorbates　interacted　with　pyrrole　N-doped　graphene,　it　carried　out　the　transition　from　pyrrole　N-doped　graphene　to　pyridine　N-doped　graphene,　and　the　most　stable　adsorption　structure　based　on　pyridine　N-doped　graphene　was　obtained　finally.　The　analysis　of　Mulliken　population　indicated　that　metal　single　atoms　had　positive　charge　while　double　atom　clusters　had　negative　charge　after　adsorbing　on　pyridine　N-doped　graphene.　The　density　of　states　and　orbital　analysis　demonstrated　that　Cu　atom　bonded　with　three　atoms　with　dangling　bonds　while　Au　atom　bonded　with　two　of　them　in　pyridine　N-doped　graphene.