Monodispersed　metal　sites　are　commonly　considered　as　active　centers　that　dominate　the　high　catalytic　activity　and　selectivity　of　a　catalyst.　Photocatalysis　is　a　complex　series　of　photophysical　and　electrocatalytic　process,　in　which,　it　still　remains　challenges　to　obtain　a　well-defined　profile　on　the　functions　of　the　monodispersed　metal　sites.　Here　we　report　that　monodispersed　aluminum　(Al)　metal　sites　are　not　active　centers　but　they　create　abundant　nitrogen　non-metal　active　centers　in　carbon　nitrides.　Density　functional　theory　(DFT)　calculations　show　that　Al　metal　sites　serve　as　the　bridges　among　isolated　carbon　nitride　layers　to　establish　diverse　transfer　channels　for　electrons,　thus　achieving　rapid　carrier　separation.　These　findings　provide　a　new　perspective　on　understanding　the　important　role　of　monodispersed　metal　sites　for　highly　effective　catalytic　reactions.