First of all, it should be clear that mucinous cystic adenocarcinoma of the ovary is a type of ovarian cancer, which belongs to epithelial ovarian cancer. For epithelial ovarian cancer, the main treatment is surgery plus postoperative adjuvant chemotherapy, and surgery requires satisfactory reduction as much as possible. For early stage cases, staged surgery is performed, and the scope of surgery includes whole uterus, both adnexa, greater omentum, pelvis, and pelvic and abdominal lymph node dissection; for advanced stage patients, in addition to these scopes, pelvic tumor lesions should be removed as much as possible to achieve satisfactory tumor reduction. If the residual lesion is less than 1 cm, it is called satisfactory tumor reduction, and we should also strive to achieve a state of no residual naked eye, and together with standard postoperative chemotherapy, we can achieve a more ideal result. For early stage patients, it is also possible to preserve her reproductive function.