In　this　work,　B　and　K　were　introduced　into　the　heptazine　structure　of　carbon　nitride　to　synthesize　the　catalyst　kalium-boron　doped　carbon　nitride　(KBCN)　with　a　larger　light　absorption　range　and　improved　photogenerated　carrier　separation　rate.　Boron　atoms　are　introduced　into　the　carbon　nitride　heptazine　units　to　optimize　the　electronic　structure　within　the　carbon　nitride　planes,　and　the　B-N　bonds　formed　by　the　heptazine　units　facilitate　charge　transfer.　Potassium　atoms　are　introduced　into　the　carbon　nitride　interlayer　as　charge　transfer　channels　to　synergistically　promote　the　transfer　of　photogenerated　electrons.　This　work　provides　a　potential　idea　for　the　doping　of　metallic　and　nonmetallic　elements　to　jointly　promote　the　charge　distribution　and　transfer　of　carbon　nitride.