The　development　of　photocatalytic　materials　is　considered　to　be　one　of　the　effective　strategies　to　alleviate　energy　shortage　and　environmental　pollution.　However,it　remains　a　challenging　goal　in　the　field　of　photocatalysis　to　simultaneously　achieve　high　efficiency,long-term　stability　and　a　wide　range　of　light　response.　In　this　paper,　BCN/　SnO2　heterojunction　were　prepared　by　hydrothermal　assisted　thermal　polymerization　of　stannic　oxide　and　graphite　phase　carbon　nitride　precursor.　Results　show　that　BCN/　SnO2　heterojunction　has　excellent　photocatalytic　degradation　activity,　and　the　degradation　rate　of　methylene　blue　(MB)　can　reach　94.　8%　when　the　simulated　sunlight　irradiation　is　40　min.　This　is　due　to　the　synergistic　effect　of　heterostructure　and　B-doping,　which　is　mainly　manifested　in　the　enhancement　of　visible　light　absorption　characteristics　by　reducing　optical　band　gap,　and　the　reduction　of　electron-hole　pair　recombination,　and　thus　improves　the　photocatalytic　activity.　In　addition,　a　model　of　interfacial　band　structure　of　heterojunction　was　constructed　by　experiments,the　active　species　and　reaction　mechanism　of　photocatalytic　degradation　were　analyzed　and　discussed　in　depth.　©　2024　Beijing　University　of　Technology.　All　rights　reserved.