The examination of ovarian cancer mainly includes the following items: 1. Ultrasound is the most simple and effective way to understand the location, size, morphology, cystic or solid changes of the mass, but it is not easy to detect small solid tumors, such as <1cm; 2. CT, MRI or PET-CT examination of the abdomen can better show the relationship between the mass and the surrounding tissues, which is beneficial to the localization of the lesion and to clarify the distant metastasis; 3. The determination of tumor markers is mainly serum CA125, which is increased in about 80% of ovarian epithelial cancer patients, but it may not be increased in early cases; 4. It can directly observe the appearance of the mass, pelvic cavity, abdominal cavity and diaphragm, and perform multi-point biopsy on suspicious areas, and also extract peritoneal fluid for cytological examination; 6.