N, Bi-codoped TiO2 samples were prepared by hydrothermal method using nanotubube titanic acid as the precursor of Ti and Bi(NO3)3·5H2O as the bismuth and N source, respectively. The photodegradation of methyl orange (MO) was tested as a model pollutant to evaluate the photocatalytic activity of N, Bi-codoped TiO2 under visible light irradiation (λ≥420 nm). The photocatalysts were characterized by X-Ray diffraction (XRD), transmission electron microscope (TEM), diffused reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS). The results indicated that the main phase of the samples was anatase, and the average grain size was 20 nm. The doped-Bi existed in the form of Bi2O3 and BiONO3. As for the doped-N species, a part of N element existed in the form of NO3- of BiONO3, and another existed in the interstitial position of the TiO2 lattice to form the Ti-O-N bond in codoped samples. N, Bi-codoped TiO2 exhibited remarkable photocatalytic activity under visible light irradiation. The codoped-TiO2 prepared at 130 ℃(Bi/Ti=1%,molar ratio) showed the highest photocatalytic activity. The enhanced photocatalytic activity of N, Bi-codoped TiO2 was more likely ascribed to the fact that doped-N and Bi increased the utilization efficiency of visible light, and while decreased the recombination rates of photogenerated electrons and holes.