Graphene　oxide　(GO)　was　fabricated　from　graphite　powder　by　Hummers　oxidation　method　and　then,　under　ultrasonic　irradiation,　a　series　of　GO/Ag3PO4　composite　photocatalysts　(4%　(w,　mass　fraction)　GO/Ag3PO4,　8%　GO/Ag3PO4,　16%　GO/Ag3PO4,　32%　GO/Ag3PO4)　were　synthesized　by　a　facile　liquid　deposition　process.　The　products　were　characterized　by　N2-physical　adsorption,　powder　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　Raman　spectra,　Fourier　transform　infrared　(FT-IR)　spectroscopg,　and　UV-Vis　diffuse　reflectance　spectroscopy　(UV-Vis　DRS).　The　effect　of　GO　content　on　the　photocatalytic　activity　of　Ag3PO4　was　evaluated　by　photocatalytic　degradation　of　methyl　orange　(MO)　under　visible　light　irradiation.　The　results　show　that　GO　can　be　easily　dispersed　into　Ag3PO4,　producing　a　well-connected　GO/Ag3PO4　composite.　Coupling　of　GO　largely　enhanced　the　surface　area　of　the　catalyst　and　the　adsorption　of　MO.　At　the　optimal　GO　content　(16%),　the　degradation　rate　of　MO　over　GO/Ag3PO4　was　83%　after　120　min　of　light　irradiation,　exhibiting　7.5　times　higher　activity　than　that　of　pure　Ag3PO4.　The　increase　in　photocatalytic　activity　and　stability　can　be　mainly　attributed　to　the　coupling　of　GO,　which　increased　the　surface　area　and　suppressed　the　recombination　rate　of　electron-hole　(e-/h+)　pairs　and　generated　greater　numbers　of　active　free　radicals.　©Editorial　office　of　Acta　Physico-Chimica　Sinica.