Abstract: The process of denitration by sodium acrylate wastewater and the mechanism of different factors affecting the process were tested on coal-fired furnace. The denitration mechanism of the organic wastewater was briefly analysed and the impacts of parameters such as temperature, oxygen content and the sodium acrylate content on the flue gas denitration process were tested. Thermogravimetric analysis and infrared spectroscopy were used to test the sodium acrylate pyrolysis process in N₂ and air atmosphere. The affecting mechanism of the temperature and oxygen content on denitration of sodium acrylate organic wastewater was studied. The result showed that intermediate products were produced during the sodium acrylate organic wastewater pyrolysis process. The intermediate products can remove NO in the flu gas by reducing NO to N₂. The optimal denitration effect was achieved with denitration efficiency of 37.6%, under the conditions of 4.1% of oxygen content, 11.1 of wastewater COD to gas NO mass ratio, the temperature at 1 360 K, and the residence time 0.82 s. The denitration efficiency increased if appropriately increasing the concentration of sodium acrylate.