Sulfated　TiO2　was　considered　to　be　one　of　the　most　promising　photocatalysts　for　enhancing　photodegradation　of　organic　pollutants.　Different　sulfate　coordinated　TiO2　catalysts　were　fabricated　for　photocatalytic　degradation　of　acetone.　The　commercial　Degussa　TiO2　treated　with　concentrated　H2SO4　showed　a　great　improvement　of　acetone　removal　of　85%　at　continuous　flow　reaction　and　no　deactivation　occurred　with　prolonging　reaction　time,　as　comparison　that　parent　TiO2　had　a　low　removal　rate　and　rapid　deactivation　for　acetone　degradation.　Two　kinds　of　SO42-　coordination　on　TiO2　were　revealed　dependent　on　the　treated　H2SO4　concentration.　Stable　bidentate　coordination　SO42-　acted　as　a　trap　center　of　photogenerated　electrons　for　photocatalytic　degradation　of　acetone.　However,　loose　monodentate　coordination　SO42-　on　TiO2　surface　was　liable　to　open　bridging　S-OH-Ti　group,　resulting　in　the　deactivation　of　photocatalytic　acetone　degradation.　This　work　provided　insight　into　the　relationship　between　sulfate　structure　and　its　photocatalytic　performance　for　sulfated　TiO2　photocatalyst.