Abstract: Borderline ovarian tumor（BOT） is characterized by histopathologic features and biologic behaviors, which intermediate between clearly benign and frankly malignant ovarian tumors. Most patients are young and in need of fertility. The majority of BOT are diagnosed at early stage, with good prognosis. Factors that are detrimental to survival are stage of the disease, the occurrence of invasive peritoneal implants and residual tumor. Fertility-sparing surgery is safe for early stage patients with no influence in overall survival. Fertility preservation is not found to be associated with an increased risk of relapse in young patients with advanced disease, and may be reasonably considered and performed on the base of comprehensive staging surgery. Laparoscopic conservative surgery has meaningful influence on recurrence rate, but has no influence on survival rate. Laparoscopic conservative surgery can be accepted under close follow-ups.