【Objective】To probe the reasons of conversion to laparotomy during gynecological laparoscopic surgery. 【Methods】Clinical records of 36 cases of conversion to laparotomy out of 1143 cases of gynecological laparoscopic surgery from January 2000 to December 2007 were analyzed retrospectively. 【Results】The rate of conversion to laparotomy was 3.15%. The reasons of conversion to laparotomy were pelvic adhension in 23 cases, technical difficulty and complication in 8 cases, malignant tumor in 3 cases. The rate of conversion to laparotomy in patients with a history of laparotomy was significantly higher than that without a history of laparotomy. The rate of conversion to laparotomy in early stage of developing laparoscopy was significantly higher than that in other stages. 【Conclusions】Pelvic adhension is the primary reason of conversion to laparotomy during gynecological laparoscopic surgery. Improving ability of performance and selecting appropriate indications prcan decrease the rate of conversion.