Organophosphorus pesticides in agricultural production of the pesticides most widely used one of the Pharmacy, as under certain conditions in the refractory and in animals can be characterized by deposition of organic phosphorus pesticide wastewater treatment in recent years, environmentalists have become the focus of the study. Represented by a nano-TiO2 photocatalytic oxidation technology to the use of atmospheric pressure at room temperature, sunlight catalytic oxidation of pollutants, and the product is generally carbon dioxide, water and other inorganic small molecule, does not have secondary pollution. However, nano-TiO2 larger band gap of only less than 388nm in the UV wavelength only catalytic performance, that is, the utilization of solar TiO2 only about 5%. In order to improve the nano-TiO2 on the utilization of sunlight so that it can in the visible range of organophosphorus pesticide degradation of waste water have a certain effect, this paper conducted the following studies: By hydrothermal synthesis at low temperatures, respectively, under the conditions of urea to ammonia and sulfur and nitrogen as nitrogen source, sulfur source was prepared N-doped, NS Co-doped TiO2 nano-doped after the use of modified nano-TiO2 below 400nm in the least squares UV irradiation on the iodine-tungsten lamp 10000 times diluted omethoate 40% degradation, the degradation rate was observed. The main conclusion of the study paper is as follows: (1) and TiO2 compared, N-doped, NS Co-doped TiO2 nanometer obvious visible activity under the visible light Omethoate degradation of pesticides has a good effect. (2) reaction temperature, the ammonia content on the N-doped TiO2 nano-catalytic activity has a great impact, with the increase in ammonia content in the catalytic activity of nano-TiO2 increased gradually. (3) NS thiourea content of Co-doped TiO2 nano-catalytic activity, with the increase of thiourea concentration of nano-TiO2 photocatalytic activity gradually increased. (4) study found that the preparation of N-doped nano-TiO2 as a white powder, while the NS Co-doped TiO2 nano-to-brown color. Co-doped TiO2 nano-NS than the N-doped TiO2 nano-high photocatalytic activity for degradation of omethoate rate. Keywords: TiO2, photocatalytic degradation, visible light, doped, omethoate,