Ovarian cancer is a common malignant tumor among women. Although it ranks third among gynecological tumors, it is more lethal than other tumors. The reason is that because ovary is deeply hidden in the pelvis, there is no obvious symptom in the early stage of cancer, and the best time for treatment is often lost when the condition is serious. Although early symptoms of ovarian cancer are not obvious, gynecologists have summed up some early symptoms of ovarian cancer through years of research and observation for reference of diagnosis: 1) Pain in waist and abdomen, which is due to the infiltration of ovarian cancer into the surrounding tissues or adhesion with the neighboring tissues, and compression of nerves can cause abdominal pain and waist pain. 2) Low menstrual period or amenorrhea. 3) Low menstrual period or amenorrhea, which is due to the infiltration of ovarian cancer into the surrounding tissues. Low menstrual flow or amenorrhea, because cancer cells will destroy normal ovarian tissues, leading to ovarian dysfunction, early symptoms of ovarian cancer may cause low menstrual flow or amenorrhea. Oedema of vulva and lower limbs, this is due to the fact that with the enlargement of ovarian cancer, the pelvic vein will be compressed, which will lead to poor blood flow and impede lymphatic reflux, resulting in oedema of vulva and lower limbs. Unexplained emaciation is due to the gradual growth of ovarian cancer and the formation of ascites, which can mechanically compress the gastrointestinal tract and cause patients to have less food and indigestion. Abdominal distension is called “red card” warning of ovarian cancer, which often occurs before touching the mass in the lower abdomen. Women with unexplained abdominal distension (especially during menopause) should do gynecological examination in time. Sixth, sex hormone level disturbance, this is because ovarian cancer can cause precocious puberty, menstrual disorder or postmenopausal vaginal bleeding. If it is testicular mother cell carcinoma, it will produce too much androgen and show signs of masculinization. When these early symptoms appear in women’s body, it is necessary to go to the hospital for consultation in time, and usually only three examinations are needed to diagnose whether there is ovarian cancer or not. I. Ultrasound: it can clarify the size and shape of cystic solid part of the tumor and the relationship with surrounding organs to identify huge ovarian cysts and ascites; II. X-ray examination: abdominal plain film of mature teratoma of ovary can be seen as tooth or bone shadow image enterography can understand the location and size of the tumor and the relationship of the intestinal tract; III. CT and MRI can be selected and applied when necessary. When ovarian cancer is detected early and treated by chemotherapy and surgery, the 5-year survival rate is very high. Women should learn to observe the changes of their own body, have regular medical checkups, and seek timely medical treatment when abnormalities are found, so as to nip malignant diseases in the bud and stay healthy forever.