This paper describes the harm to the circulating water system in synthetic ammonia plant caused by the leaking of ammonia and nitrobacteria,and relative countermeasures are presented.

• 介绍了合成氨厂循环水系统漏氨较为严重时对杀菌灭藻的危害以及硝化菌群对系统的影响，提出搞好循环水系统运行的一些措施。