In this paper an improvement in the photocatalytic performance of TiO2 was carried out via hybridizing with graphene.Graphene-TiO2 (GR-TiO2) nanocomposites with different weight addition ratios ofgraphene oxide (GO) have been prepared via a facile microwave irradiation of GO and tetrabutyl titanate in isopropyl alcohol.Raman spectroscopy (RS),X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM),UV visible spectroscopy (UV vis),Fourier transform infrared spectra (FTIR),energy dispersive X-ray spectroscopy (EDX) and photoluminescence spectra (PL) are employed to determine the properties of the samples.Microwave irradiation can heat the reactant to a higher temperature in a short time,simultaneously GO is reduced to graphene and TiO2 nanoparticles grown on the surface ofGR.GR-TiO2 nanocomposites synthesized via this approach have efficient electron conductivity in GR,resulting in a reduced electron-hole recombination rate.Among the synthesized nanocomposites,GT-8wt％ exhibited the best photocatalytic activity toward photocatalytic degradation of MB.Our current work provides a new insight for the fabrication ofGR-TiO2 nanocomposites within a short reaction time and also explains the mechanism of photocatalysis employing radical and hole scavengers.