TiO2, N-TiO2, Zr-TiO2 and Zr-N codoped TiO2 were prepared by hydrolyzation- precipitation method. Crystal structure, elemental composition and visible lights response of prepared samples were characterized by XRD, TEM, XPS, and UV-Vis-DRs, and its photocatalysis properties were studied by photocatalytical degradation of methyl orange. The results indicate that Zr doping could decrease the particle size of nanoparticles, and Zr-N co-doping has a synergistic effect that could improve the photocatalysis efficiency and the visible absorption capacity of samples. Zr-N co-doped TiO2 has higher photo...