In recent years, Regional citrate anticoagulation (RCA) technology has been widely used not only in adult blood purification, but also in children’s blood purification, and its advantages in patients with high bleeding risk, active bleeding and heparin-induced thrombocytopenia have been repeatedly confirmed. Therefore, this article reviews and analyzes the application of RCA in different blood purification modes at home and abroad in recent years. It is found that its anticoagulation is not only safe and effective, but also can prolong the life of filter and reduce bleeding complications, which is suitable for the practice of blood purification.