The ammonia synthetic system in Hebei Jinwantai Fertilizer Corporation Ltd.(Jinwantai company) includes two sets of φ1 200 and φ2 200, and φ2 200 ammonia synthetic system uses evaporative condenser. The ammonia working principle, equipment parameters, maintenance management, technological process and ammonia operating system operating parameters of Jinwantai Company's evaporative condenser were introduced, and the advantages of the evaporative condenser were analyzed from several aspects of water saving, energy saving and investment. It is put forword that the evaporative condenser was put into operation in 2011 so far, the total amount of water used in the harshest conditions（9.6 t  h） was significantly lower than that of other water cooler（ 26 t / h ）, the electricity consumption decreases by about 70 %, the investment saves a half.