ObjectiveTo investigate the clinical effect of transversus abdominis plane (TAP) block as part of multimodal analgesia in enhanced recovery after surgery (ERAS) program for patients with hepatic hydatidosis. MethodsThis study was a randomized controlled trial (The registration number was ChiCTR2100053689). According to the established inclusion and exclusion criteria, the patients diagnosed with hepatic hydatidosis treated in the People’s Hospital of Aba Tibetan and Qiang Autonomous Prefecture from October 2019 to August 2021 were prospectively included. The odd and even by obverse and reverse of coin was adopted to assign into the study group and the control group, respectively. The patients in the study group were treated with ERAS + TAP block + patient controlled intravenous analgesia (PCIA) + tramadol and the patients in the control group were treated with ERAS + PCIA + tramadol. The intraoperative and postoperative statuses of the two groups were compared. ResultsA total of 64 patients were enrolled in this study, including 32 patients in the study group and 32 patients in the control group. There were no statistical differences in the baseline data such as the age, gender, preoperative complications, preoperative liver function, and liver hydatid type between the two groups (P>0.05). The operations of 64 patients were performed successfully, and there was no perioperative death. There were no statistical differences in the operation time, intraoperative bleeding, and operation mode between the two groups (P>0.05). Compared with the control group, the points of visual analogue scale of postoperative pain on day 1 and 2 were lower (P<0.05), the dosage of tramadol within 2 d after operation and hospitalization expenses were less (P<0.05), and the getting out of bed time, eating liquid diet time, postoperative exhaust time, and total hospital stay were shorter (P<0.05) in the study group. The total complication rate of the study group was lower than that of the control group [28.1% (9/32) vs. 78.1% (25/32), χ2=16.063, P<0.001]. The comprehensive complication index was positively correlated with the total hospital stay (r=0.941, P<0.001) and hospitalization expenses (r=0.958, P<0.001). ConclusionPreliminary results of this study suggest that multimodal analgesia included TAP block is effective in ERAS, and could shorten hospital stay and reduce hospitalization expenses.