Objective:To monitor the levels and changes of serum soluble interleukin-6 receptor(sIL-6R) in renal allograft recipients and to clarify its clinical significances. Methods:Clinical and baseline data of all enrolled patients were recorded in detail and an-other 20 healthy volunteers were chosen as normal controls. Sequential monitoring of serum sIL-6R was conducted by ELISA tech-nique in 60 patients before and after renal allograft. Results:There was no difference in serum sIL-6R level between normal controls and patients before renal allograft. After renal allograft,levels of serum sIL-6R were firstly increased,reaching the peak on the 3rd d then were decreased after targeted treatment and were reduced to levels before renal allograft after two weeks(F=15.23,P=0.003). Fur-ther study demonstrated that levels of serum sIL-6R were significantly increased in renal allograft recipients complicated with infection(LSD-t=7.32,P=0.004). Conclusions:Sequential monitoring of immunologic marker,serum sIL-6R in renal allograft recipients can be used to judge the acute rejection reactions at early stage and the combined complications.