The hallmark of osteoarthnitis(OA) is the loss of articular cartilage caused by an imbalance between cartilage synthesis and degredation over a variable period of time.IL-1 plays an important role in the course.The IL-1receptor antagonist(IL-Ra) specific against IL-1 is becoming a pivot of wide attention.The article offers a review of the relationship between the IL-1Ra and OA.