Abstract: A2×660 MW power plant is an ultra-supercritical secondary reheating process unit.The flue gas denitrification treatment adopts SCR process,in which the reducing agent adopts urea hydrolysis to ammonia process system.Through the performance test of the process,the results show that the process has excellent operating parameters,stable gas pressure of the supply product,ammonia flow rate of the product can meet the response capacity of the boiler when the load is increased,and each index basically reaches the design performance value,which can replace liquid ammonia to provide guarantee for the safety and stability of ammonia supply in the boiler denitration system.