The　CH4　conversion　under　ambient　condition　remains　a　challenge　over　the　past　years,　and　the　production　of　the　ideal　clean　energy　of　H2　is　considered　as　an　alternative　method　to　meet　the　requirement　of　sustainable　development.　Herein,　a　new　photocatalytic　reaction　system　involved　H2　evolution　from　aqueous　water　and　CH4　conversion　is　established　over　Pt/TiO2.　The　synergistic　effect　between　the　two　reactions　of　H2　production　and　CH4　conversion　brings　up　the　considerable　quantum　efficiencies　of　H2　production　to　4.7%　without　sacrificial　agent　and　CH4　conversion　(the　main　products　are　C2H6　and　CO2)　to　3.3%　simultaneously.　The　introduction　of　Pt　on　the　surface　of　TiO2　particles　facilitates　the　activation　of　CH4　and　[rad]OH　that　can　assist　to　produce　methyl　radical　([rad]CH3),　afterwards　more　C2H6　(61.7%　selectivity)　is　formed.　©　2016　Elsevier　B.V.