Abstract: Flue gas denitrification treatment must be carried out for flue gas in thermal power generation and petrochemical industries.When NOxis reduced to harmless N2,it is then discharged into the atmosphere. Denitrification reducers are usually liquid ammonia and urea. Due to the major security hidden danger of liquid ammonia,there are certain limits on storage and transport,and liquid ammonia has been listed as one of major hazards. Urea is the most choice for reducing agent at present. Ammonia production from urea decomposition includes urea pyrolysis and urea hydrolysis technology,and urea hydrolysis technology is divided into ordinary urea water solution urea and catalytic hydrolysis technology. By studying the reaction mechanism of urea ordinary hydrolysis technology without catalyst and urea catalytic hydrolysis technology with catalyst,as well as the change of reaction rate,hydrolysis rate and energy consumption random group load,it is found that adding urea catalytic hydrolysis catalyst manufacturing technology by adding ammonia catalyst changes the chemical reactions in the middle of the process. At the same temperature conditions,the addition of catalyst makes chemical reaction activation energy reduced,the reaction rate constant,reaction speed and response speed faster,so as to achieve the effect low-temperature operation,thus resulting in lower energy consumption and increasing urea utilization rate of more than 99%; Corrosion is reduced,which solves the rapid change of ammonia demand and corrosion caused by high temperature operation that the ordinary hydrolysis can not meet. It is found that an intermediate product is formed by the reaction between the catalyst and urea. And the intermediate product is decomposed into a catalyst,which is not consumed in the whole reaction and does not increase the operating cost of the system compared with the ordinary hydrolysis technology.