TiO2/g-C3N4 composite nanofibers have been successfully synthesized by one-step electrospinning method, using titanium (IV) n-butoxide (TNBT) and urea as raw materials. The structure and compositions of TiO2/g-C3N4 samples are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Diffuse reflectance spectroscopy (DRS), Scanning electron microscopy (SEM), Transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS) and BrunauerEmmett- Teller (BET), respectively. The results show that the porous uniform TiO2/g-C3N4 composite nanofibers, with diameter of 100-150 nm, can be successfully prepared through electrospinning method combining 550. C calcination process. The photocatalytic activity is evaluated by the degradation of rhodamine B (RhB) under simulated solar light. The enhanced catalytic activity is attributed predominantly to the heterojunction between TiO2 and g-C3N4, which promotes the transferring of carriers and prohibits their recombination. With the optimal doping amount of 0.6 g urea (corresponding to 3 g TNBT), the TiO2/g-C3N4 composite nanofibers exhibit the highest rate towards the photocatalytic degradation of RhB. A diagram is presented to explicate the mechanism of the whole catalytic experiment. This study might provide a promising future of applying green catalysts to solving water pollution problems. (C) 2017 Published by Elsevier B.V.