This study evaluate the Hyperthermic Intraperitoneal Chemotherapy(HIPEC) in the treatment of Stage IIc-IV epithelial Ovarian Cancer after primary Cytoreductive Surgery (CRS).Half participants will receive HIPEC twice with one intravenous chemotherapy and 5 cycles of intravenous chemotherapy with carboplatin and paclitaxel after CRS. Half participants will receive 6 cycles of intravenous chemotherapy with carboplatin and paclitaxel after CRS.

Advanced epithelial ovarian cancer, now recognized as the most effective treatment is maximizing tumor reduction (cytoreductice surgery, CRS) within the abdominal cavity with platinum-based chemotherapy (intraperitoneal chemotherapy, IPEC) or intravenous chemotherapy.

Hyperthermic intraperitoneal chemotherapy (HIPEC) refers to the chemotherapy drugs will be diluted and heated to the specified temperature (usually the 42 degrees), then injected into the abdominal cavity, maintain a constant temperature, repeated perfusion filling, so as to achieve the purpose of prevention and treatment of intra-abdominal tumors of a way of treatment.

CRS combined with HIPEC is the most effective treatment strategy for peritoneal cancer at present.

Inclusion Criteria:

1. the patient voluntarily joined the study and signed the consent form;
2. female patients aged between 18 and 70 who are not pregnant or lactating;
3. primary epithelial ovarian cancer, fallopian tube cancer and primary peritoneal cancer were diagnosed at the time of diagnosis, and no chemotherapy or radiotherapy was given within three months before the study began;
4. laparoscopic Fagotti score <6;
5. residual lesions in abdominal cavity after tumor cell extinction <1cm;
6. expected survival time ≥12 weeks;
7. ECOG score: 0-1;
8. bone marrow reserve function is good, and blood routine indexes meet the following requirements: white blood cell count ≥3.0×109/L, neutrophil absolute count ≥1.5×109/L, platelet count ≥100×109/L, hemoglobin ≥90 g/L;
9. important organs function well and blood biochemical indexes meet the following requirements: serum albumin ≥30 g/L, ALT≤2.5× normal upper limit (ULN), AST≤2.5×ULN, serum total bilirubin ≤1.5×ULN, serum creatinine ≤1.5×ULN.

Exclusion Criteria:

1. refuse to sign the informed consent;
2. other malignant tumors in the past 5 years or at the same time, except cured basal cell carcinoma of skin, cervical carcinoma in situ, thyroid papillary carcinoma and breast cancer without recurrence 3 years after radical resection;
3. laparoscopic Fagotti score ≥6;
4. extensive adhesion exists in the abdominal cavity.
5. >1cm of residual lesions in the abdominal cavity after tumor cell extinction;
6. patients with previous gastrointestinal perforation, abdominal abscess or recent intestinal obstruction (within 3 months), or with imaging and clinical symptoms indicating intestinal obstruction;
7. suffer from other difficult to control serious diseases, including uncontrolled hypertension, NYHA grade 2 or above heart failure, unstable angina, atrial fibrillation, myocardial infarction (within the previous 1 year), renal insufficiency, uncontrollable infection, etc.;
8. significant clinically significant bleeding symptoms and abnormal coagulation function (INR>2.0 or prothrombin time >16s) within the previous 3 months, with a clear tendency to bleeding or being treated with thrombolysis or anticoagulant therapy;
9. occurrence of thrombotic events in the past six months, such as cerebrovascular accident, deep vein thrombosis and pulmonary embolism;
10. congenital or acquired immune deficiency;
11. with active hepatitis, active ulcer, unhealed wound or fracture;
12. being treated with other anticancer drugs;
13. the investigator assessed and determined that there were any other unstable conditions, including alcohol abuse, drug abuse, other family or social factors, that might affect patient safety and compliance or cause the study to be discontinued.