Objective:To observe the effect of ultrasound-guided suprainguinal fascia iliaca compartment block(U-SFICB)with ropivacaine combined with different doses of nalbuphine on analgesia in elderly patients after total hip arthroplasty(THA).Methods:101 elderly patients with unilateral THA under general anesthesia were divided into four groups according to different anesthesia regimens:100 mg ropivacaine+normal saline group(R group,n=26),100 mg ropivacaine+10 mg nal-buphine group(LN group,n=25),and 100 mg ropivacaine+15 mg nalbuphine group(MN group,n=25),and 100 mg ropiv-acaine+20mg nalbuphine group(HN group,n=25),all were diluted to 30 mL with 0.9%sodium chloride injection.All four groups underwent U-SFICB in the post-anesthesia care unit(PACU),and sufentanil was used for patient-controlled intravenous analgesia after surgery.Comparison between groups of postoperative 4,8,12,24,and 48 h of resting and motion state of Numer-ical rating scale(NRS).Each group received 12 h preoperatively,12 and 24 h postoperatively,Interleukin 6(IL-6),Tumor nec-rosis factor-α(TNF-α),Interleukin 10(IL-10)concentration,the first start time of postoperative analgesia pump and 48 h of sufentanil use in each group,the early postoperative recovery of each group,and the occurrence of analgesia related adverse reac-tions 48 h after surgery were compared between groups.Results:Compared with R group and LN group,NRS score in MN and HN group was decreased at all time points(P<0.05),IL-6 and TNF-α concentrations were decreased at all time points(P<0.05),IL-10 concentrations were increased at all time points(P<0.05),and the start-up time of postoperative analgesia pump was significantly extended(P<0.05).The amount of sufentanil was significantly decreased 48 hours after operation(P<0.05).Compared with R group,LN group and HN group,the time of first anal exhaust and getting out of bed in MN group were significantly shortened(P<0.05).The incidence of adverse reactions was significantly decreased 48 h after operation(P<0.05).Compared with HN group,the start-up time of postoperative analgesic pump in MN group was significantly short-ened(P<0.05),and the overall incidence of adverse reactions was the lowest at 48 h after surgery(P<0.05).Conclusion:15 mg nalbuphine combined with ropivacaine can significantly prolong the duration of U-SFICB analgesia after THA in elderly pa-tients,and the first postoperative anal exhaust time and the first time of getting out of bed activity are the shortest,and the inci-dence of adverse reactions is the lowest within 48 hours after surgery,which can be clinically promoted and applied.