Using MnSO 4¨H2 O as manganese source and urea as nitrogen source, Mn/N co-doped TiO 2 loaded on wood-based activated carbon fiber (Mn/Ti-N-WACF) was prepared by sol-gel method. Mn/Ti-N-WACF with different Mn doping contents was characterized by scanning electron microscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopies (XPS), and ultraviolet-visible spectrophotometer. Results showed that the loading rate of TiO 2 in Mn/Ti-N-WACF was improved by Mn/N co-doping. After calcination at 450˝C, the degree of crystallinity of TiO 2 was reduced due to Mn/N co-doption in the resulting Mn/Ti-N-WACF samples, but the TiO 2 crystal phase was not changed. XPS spectra revealed that some Ti 4+ ions from the TiO 2 lattice of Mn/Ti-N-WACF system were substituted by doped Mn. Moreover, new bonds formed within N-Ti-N and Ti-N-O because of the doped N that substituted some oxygen atoms in the TiO 2 lattice. Notably, the degradation rate of methylene blue for Mn/Ti-N-WACF was improved because of the co-doped Mn/N under visible-light irradiation.