为实现以反渗透代替一级复床系统制取高压锅炉补给水之目的，试验以超滤进行预处理，结果证明，超滤较传统的预处理工艺具有十分明显的优势．针对超滤过程中存在的浓差极化问题，通过对运行条件及清洗方式的试验研究，得到了令人满意的结果，此外还对超滤的分离机理、分离性能等进行了讨论． In order to achieve the purpose of making the high-pressure boiler make-up water by reverse osmosis instead of the first-level double-bed system, the experiment was pretreated by ultrafiltration. The results show that the ultrafiltration has obvious advantages over the traditional pretreatment. In view of the problem of concentration polarization existing in the process of ultrafiltration, satisfactory results have been obtained through the experimental study of operating conditions and cleaning methods. In addition, the separation mechanism and separation performance of ultrafiltration are also discussed.