Titanium dioxide (TiO2) has been known as one of the mostpromising photocatalytic materials and attracted much attentiondue to its good stability, nontoxicity, high efficiency and low cost[1-3]. However, TiO2with the wide band gap (Eg= 3.2 eV) can onlyabsorb the near-UV light ( < 380 nm)[4], which greatly limits itspractical applications. In order to overcome this shortcoming, theappropriate modifications such as non-metal doping and metaldoping are essential for TiO2to make maximum use of the visible-light region of sun. In the past few years, plenty of researches havebeen reported that doping TiO2with non-metal elements, suchas carbon, boron, fluorine and nitrogen demonstrated enhancedvisible light photocatalytic activities [5-8]. Among them, nitrogendoping has been proved to be a simple and effective method toattain visible-light photocatalysis [9]. However, most of studies onnitrogen doped TiO2considered that the nitrogen doping is onlya surface or sub-surface modification and difficult to narrow .band gap in the bulk of TiO2, thus, it could only improve the visiblelight absorption in the range of 400-600 nm. It is really difficult toachieve the absorption in the wider region of 400-800 nm only bythe heterogeneous nitrogen doping.