This will be a prospective, open, parallel, randomized, controlled clinical trial, designed to compare the advantages and disadvantages of laparoscopy and laparotomy in diagnosing and treating early malignant ovarian cancer in terms of surgical safety, postoperative survival rate, reoperation rate, postoperative quality of life and medical cost, to provide evidence for clinical application of laparoscopic surgical staging in in diagnosing and treating early malignant ovarian cancer, and to fill some gaps in the evidence for laparoscopy versus laparotomy. Endoscopic surgical staging of early malignant ovarian cancer accords with the trend of minimal invasion and radical treatment for tumors.