The　thin　films　of　TiO2　center　dot　ZnO,　Fe2O3　and　heterojunction　thin　films　of　ZnO/TiO2,　Fe2O3/TiO2　were　prepared　on　quartz　glass　by　dip-coating　technique.　The　photocatalytic　degradation　of　methylene　blue　on　these　films　(lambda　=　254　nm)　showed　that　the　photocatalytic　activities　of　three　films　were　in　the　following　sequence:　TiO2　＞　ZnO　＞　Fe2O3,　TiO2/ZnO　＞　TiO2　＞　TiO2/Fe2O3.　Compared　with　the　films　of　pure　ZnO　and　Fe2O3,　heterojunction　films　of　ZnO/TiO2　and　Fe2O3/TiO2,　had　smaller　contact　angles,　while　Fe2O3/TiO2　film　showed　super-hydrophilic　property.　To　explain　this　result,　a　model　of　heterojunction　band　of　Fe2O3/　TiO2,　TiO2/Fe2O3　and　ZnO/TiO2,　TiO2/ZnO　were　set　up.　The　heterojunction　band　formed　between　the　two　seminconductors　interface　changed　the　transfer　process　of　photogenerated　electron-hole.　Time-resolved　photoconductivity　spectra　and　Auger　electron　spectra　results　approved　this　explanation.