Stage 1a ovarian intraepithelial cancer has a relatively good prognosis with a five-year survival rate of about 90% after treatment by surgery and other methods. Ovarian cancer is a common malignant tumor of female reproductive system, and the occurrence of the disease is related to various factors such as gene mutation and age, etc. Stage 1a represents that the tumor is confined to one side of the ovary, with intact peritoneum, no tumor on the surface of the ovary, and the ascites or abdominal lavage fluid is negative. In this period, the tumor can mostly be treated by radical surgical resection, and then supplemented with chemotherapy after surgery according to the condition, commonly used drugs such as paclitaxel, carboplatin and docetaxel. After active treatment, patients with stage 1a ovarian cancer can obtain a five-year survival rate of about 90%. Although the prognosis is better, attention should still be paid to regular review as prescribed by doctors.