The metastatic pathways of ovarian cancer are as follows: 1. Direct spread: it can directly pass through the surrounding peritoneum and fallopian tube and invade to the fallopian tube, uterus and intestinal surface, which is equivalent to the direct spread of the surrounding organs; 2. Lymphatic metastasis: ovarian cancer transfers to the lymph nodes on the surface of intra- and extra-luminal blood vessels through the portal vessels of the ovaries and to the lymphatic tissues in the inguinal lymphatic tissue through the round ligaments; 3. Hematogenous metastasis: it is relatively rare, and can be transferred to the lungs and the liver parenchyma through the blood system; 4. Wide metastasis: it is common in the middle- and late-stage patients who have extensive cancer metastases in their abdominal area, and it is difficult for them to undergo surgery.