A kind of nitrogen and carbon co-doped titanium dioxide(( N,C)-TiO_2) was prepared by a simple,fast and energy-saving method,by which composite consisting of TiO_2precusor( fabricated by sol-gel method) and guanidine hydrochloride was irradiated by microwave. X-Ray diffraction( XRD),scanning electron microscopy(SEM),UV-visible diffuse reflection spectra(UV-Vis DRS),dark adsorption of methylene orange and photo-catalysis were employed to characterize the prepared samples. It is shown that the prepared sample...