【Abstract】 Objective To analyze the influence of improved laparoscopic sharp decollement on perioperative indicators, ovarian function and postoperative complications in patients with ovarian endometriosis (EMs). Methods 90 patients with ovarian EMs admitted to the hospital from January 2013 to December 2016 were selected as the subjects. They were randomly divided into the observation group and the control group, 45 cases in each group. The control group was treated by routine laparoscopic blunt decollement, while the observation group was treated by improved sharp decollement. The perioperative indicators, levels of sex hormones ［luteinizing hormone (LH), follicle stimulating hormone (FSH), estradiol (E2)］before and after operation, ovarian function ［antral follicle count (AFC) ovarian volume］and complications in the two groups were recorded. Results The intraoperative blood loss of observation group was less than that of the control group (P＜0.01). The thickness of removed lesions at central ovary and ovarian hilum and the thickness of removed ovarian cortex in the observation group was smaller than that in the control group (P＜0.01). There was no significant difference between the two groups in operation time or hospital stay (P＞0.05). There was no significant difference in the levels of LH, FSH and E2 between the two groups before and after operation (P＞0.05). The AFC and ovarian volume of the two groups were decreased after operation, but the AFC and ovary volume of the observation group were larger than those of the control group (P＜0.01). There was no significant difference in the incidence of postoperative complications between the two groups (1110% vs 1554%) (P＞0.05). Conclusion Under improved laparoscopic sharp decollement, the blood loss is less, the thickness of removed lesions at central ovary and ovarian hilum and the thickness of removed ovarian cortex is small. The treatment can well preserve the ovarian function. Its safe and reliable.