Objective To study the effect of bile reinfusion on immunologic function of erythrocyte in patients with obstructive jaundice after external drainage of biliary tract.Methods Patients with obstructive jaundice who had received biliary tract external drainage were randomly divided into bile reinfusion group ( n =24) and simple external drainage group ( n =27). Patients without jaundice,who received cholecystectomy in the same period with the above ones,were selected randomly as control group( n =25). In external drainage groups patients’ bile was collected daily, and was filtered through gauze, and then, pumped back into the patients’ duodenum or jejunum after being heated to 38 ℃-40 ℃. The bile reinfusion could be started after the intestinal function recovered postoperatively. The changes of C 3bRRT, ICRT, RFER and RFIR were observed before and after operation. The data were analysed through SPSS8.0.Results Preoperative C 3bRRT and RFER levels in patients with obstructive jaundice were lower than those without jaundice significantly, and Preoperative ICRT and RFIR levels in patients with obstructive jaundice were higher than those without jaundice significantly. C 3bRRT levels in bile reifusion group was higher obviously than those in simple drainage group ( P