Combined with the operation status quo of the ultrafiltration system of the desalina-tion station in an iron and steel company's self-provisioned power plant,this paper analyzes the multiple causes of fiber breakage of membrane elements in ultrafiltration system,and puts forward targeted improvement measures in terms of process optimization,equipment improvement,cleaning standards and operation management,etc.,so as to improve the quality of ultrafiltration system of the desalination station,and to satisfy the requirements of the reverse osmosis system's influent wa-ter quality,which ensures the safe and stable operation of the ultrafiltration and reverse osmosis sys-tems in the desalination station.