In　this　work,　TiO2　was　modified　by　doping　the　electron-deficient　B　element,　and　then　the　gas-sensing　response　of　B-TiO2　to　H2　under　UV　irradiation　at　room　temperature　in　a　N2　atmosphere　and　the　oxidation　of　H2　over　B-TiO2　under　corresponding　conditions　were　tested.　It　was　found　that　H2　would　accept　an　electron　when　adsorbed　on　the　TiO2　surface,　while　H2　would　donate　an　electron　when　adsorbed　on　the　B-TiO2　surface.　Correspondingly,　H2　could　not　be　oxidized　over　TiO2,　but　could　be　oxidized　over　B-TiO2.　This　indicated　that　the　oxidation　of　H2　was　dependent　on　the　electron-transfer　behavior　between　H2　and　the　surface　of　TiO2　or　B-TiO2.　Based　on　the　relevant　characterization　results,　it　was　proposed　that　H2　could　accept　an　electron　from　TiO2　due　to　the　higher　Fermi　level　of　TiO2,　while　H2　could　donate　an　electron　to　B-TiO2　due　to　the　lower　Fermi　level　of　B-TiO2　induced　by　doping　B.　This　indicated　that　the　electron-transfer　behavior　between　H2　and　TiO2　could　be　changed　by　adjusting　the　Fermi　level　of　TiO2,　while　the　electron-transfer　behavior　would　further　affect　the　photocatalytic　activity　of　oxidizing　H2.　This　result　shows　that　the　doable　H2　photocatalytic　oxidation　in　thermodynamics　can　be　controlled　by　a　kinetics　factor　(H2　losing-an-electron　behavior).　This　work　can　be　applied　to　provide　an　understanding　of　the　photocatalytic　oxidation　behavior　of　other　reactants　over　semiconductor　materials.　This　journal　is　©　the　Owner　Societies.