(A) Treatment principles The main treatment of ovarian malignant tumor is surgery and supplemented by radiation therapy, chemotherapy, Chinese medicine and other comprehensive treatments. (B) Surgical treatment of ovarian cancer Surgery includes detailed exploration of pelvic and abdominal organs, palpation of pelvic retroperitoneal lymph nodes and multi-point biopsy of the diaphragm, peritoneum and greater omentum for accurate tumor staging and surgery is divided into complete surgery and conservative surgery to preserve fertility. The complete remission rate of postoperative chemotherapy for patients with extensive implantation and metastasis in the pelvis was 83% in patients with complete surgical resection and 59% in those with basic resection (residual tumor <2 cm in diameter) and 42% in those with partial resection (residual tumor >2 cm in diameter), thus although malignant germ cell tumors are sensitive to combination chemotherapy, the complete remission rate of postoperative chemotherapy is as high as possible. Therefore, although malignant germ cell tumors are sensitive to combination chemotherapy, surgical removal of the tumor as cleanly as possible is still a key to successful treatment. (c) Chemotherapy for ovarian cancer Since ovarian tumors spread very early, most cases cannot be removed by surgery and the effect and application of radiotherapy are limited, systemic chemotherapy is an important adjuvant treatment. There is no uniform chemotherapy regimen for the treatment of malignant ovarian tumors so far, the principles are: ① high dose intermittent medication is better than small dose continuous medication; the former means that each course of medication for about 1 week with an interval of about 3-4 weeks can achieve effective anti-tumor effects and help the body to eliminate toxicity and restore immune function; ② combination chemotherapy is better than single chemotherapy: in recent times, there is a tendency to combine medication, but it should be noted that the toxicity of combination chemotherapy is heavy; ③ ③ According to the drug sensitivity test to choose sensitive chemotherapy drugs can prolong the survival time of patients; ④ according to the tissue type to develop different chemotherapy regimens. (d) Radioimmunotherapy The radiosensitivity of ovarian malignant tumors varies greatly between ovarian endodermal sinus tumors immature teratoma embryonal carcinoma is the least sensitive ovarian epithelial carcinoma and granulosa cell carcinoma are moderately sensitive asexual cell carcinoma is the most sensitive asexual cell carcinoma can be controlled mostly with radiotherapy after surgery because ovarian cancer occurs early in the abdominal cavity metastasis, so the irradiation scope includes abdominal cavity and pelvic cavity liver and kidney area should be protected to avoid radiation damage radiation volume of the whole abdominal cavity is 3000cGY~5000cGY/6~8 weeks.