Abstract:【Objectives】 This RCT aimed at evaluating the efficacy and safety of single-site gasless laparoscopic ovarian cystectomy during pregnancy compared with those of conventional laparotomy. 【Methods】 A total of 45 patients with ovarian cyst requiring ovarian cystectomy were randomly allocated to the single-site gasless laparoscopy group (23 cases) or the laparotomy group (22 cases). All the procedures were performed with epidural anesthesia. Main outcome measures were blood loss, operating time, postoperative visual analog scale (VAS), postoperative use of paregoric, time to flatus, postoperative hospital stay, postoperative fever, and postoperative wound infection. 【Results】 No patients in the single-site gasless laparoscopy group encountered complications during the intra- and post-operative periods. No significant differences were noticed between the single-site gasless laparoscopy group and the laparotomy group for blood loss and postoperative wound infection (P >0.05). There were significant differences for operating time and postoperative fever (P <0.05). There were also significant differences for postoperative VAS, postoperative use of paregoric, time to flatus and postoperative hospital stay (P <0.01). 【Conclusion】 Single-site gasless laparoscopic ovarian cystectomy during pregnancy by an experienced team, is a safe and effective procedure. Compared to the traditional laparotomy, it allows a shorter hospital stay, a reduced rate of post-operative complications and a decreased maternal and fetal morbidity. Single-site gasless laparoscopy is a feasible and safe approach in the surgical treatment of ovarian cystectomy in pregnancy.