Objective To investigate the impact of enhanced recovery after surgery (ERAS)on immune function in patients undergoing laparoscopic hepatectomy.Methods Sixty patients undergoing laparoscopic hepatectomy (34 males,26 females,aged 38-57 years,ASA Ⅰ or Ⅱ),were randomly divided into two groups:enhanced recovery after surgery group (group E)and non-enhanced recovery after surgery group (group C).The patients in group E received enhanced recovery after surgery,while the patients in group C received routine perioperative management and anesthesia methods.The operation method and time,the volume of bleeding,the intraoperative fentanyl con-sumption,the volume of fluid input,the preoperative and postoperative CVP and temperature were recorded in the two groups.Blood samples were obtained before induction (T0 ),at the end of opera-tion (T1 ),on day 1 (T2 ),day 3 (T3 ),day 7 (T4 )after operation for determination of plasma con-centration of IgA,IgM,IgG and the percentages of T lymphocyte subsets (CD3+ ,CD4+ ,CD8+ ) and CD4+/CD8+ ratio were detected with flow cytometry.Furthermore,the visual analogue scale (VAS)score and Ramsay score were evaluated 4 hours,8 hours,24 hours and 48 hours after opera-tion in two groups.Results Compared with group C,the intraoperative fentanyl consumption,the volume of fluid input and the postoperative CVP in group E were significantly decreased,while the postoperative temperature was significantly increased (P < 0.05 ).Compared with T0 , the percentages of CD3+ ,CD4+ ,the CD4+/CD8+ ratio and the plasma concentration of IgA,IgM,IgG in group E on T1-T3 were significantly decreased,the percentages of CD3+ ,CD4+ ,the CD4+/CD8+ratio and the plasma concentration of IgA,IgM,IgG in group C on T1-T4 were significantly decreased (P <0.05).Compared with group C,the percentages of CD3+ ,CD4+ ,the CD4+/CD8+ ratio and the plasma concentration of IgA,IgM,IgG in group E on T1-T4 were significantly increased (P <0.05),the visual analogue scale (VAS)score 4 hours,8 hours,24 hours after operation were signifi-cantly decreased (P <0.05).The comparision of Ramsay scores at all the time points between two groups were similar.Conclusion ERAS applied to patients undergoing laparoscopic hepatectomy can reduce the intraoperative fentanyl consumption,prevent the occurrence of hypothermia and provide satisfactory postoperative analgesia,which can significantly improve the immune function in patients.