In　this　study,　a　novel　composite　functioned　as　adsorption-photocatalysis　based　on　bismuth　oxide　(Bi2O3),　reduced　graphene　oxide　and　titanium　dioxide　(TiO2)　(labelled　as　BRGT)　was　applied　in　combination　with　ceramic　membrane　ultrafiltration　to　removal　natural　organic　matter　(NOM)　and　to　mitigate　membrane　fouling.　The　mechanisms　of　NOM　removal　and　of　membrane　fouling　were　investigated.　The　dual　action　of　adsorption　and　photocatalysis　by　the　BRGT　effectively　degraded　NOM,　giving　a　removal　efficiency　of　22.2　%　for　dissolved　organic　carbon　and　73.0　%　for　UV　absorbance　at　254　nm.　center　dot　O-2(-)　radicals　were　mainly　involved　in　the　degradation　of　humic　and　protein/polyphenol-containing　fluorescent　components　of　NOM.　BGRT　had　a　high　adsorption　affinity　for　protein-like　components,　whose　removal　depended　more　on　h(+).　The　fouling　behavior　of　the　ceramic　membrane　was　the　result　of　pore　blocking　combined　with　cake　filtration　formation.　BRGT　mainly　adsorbed　hydrophobic　components,　which　exacerbated　the　reversible　fouling　resistance　and　transformed　the　fouling　mechanism　from　standard　blocking　into　complete　blocking.　With　increase　of　photocatalytic　time,　the　hydrophobic　fraction　was　converted　into　hydrophilic　and　transphilic　fractions,　and　large　and　medium　molecular　weight　organics　were　degraded　into　small　molecules.　In　this　case,　the　cake　filtration　formation　occurred　much　earlier,　with　reversible　membrane　resistance　reduced　by　95.5　%　and　irreversible　membrane　resistance　reduced　by　90.4　%　at　60　min.　From　the　results　we　concluded　that　NOM　can　be　effectively　treated　with　adsorption-photocatalysis　by　BRGT,　especially　its　fluorescent　fractions,　which　has　great　potential　in　alleviating　ceramic　ultrafiltration　membrane　fouling.