Abstract: Objective To investigate advantages of extraperitoneal pelvic lymphadenectomy adopted in radical surgery operation of gynecological malignancy.Methods In radical surgery operations of invasive cervical carcinoma and endometrial carcinoma,47 cases were choosed to be done with extraperitoneal pelvic lymphadenectomy,the method of the operation and its advantages are also elaborated in detail.Results In addition to the results of the right common iliac vein and left obturator vein injury each exception,and the remaining patients were operated smoothly,with none of gastrointestinal reactions such as nausea and vomiting,and other cardiovascular complications.The operational time shortened 30 minutes compared with innerperitoneal lymphadenectomy.11 cases with lymphatic cyst and 1 case with abdominal incision lymphatic leak occurred after operation have been recovered after corresponding treatment.Conclusion The adoption of extraperitoneal pelvic lymphadenectomy in radical surgery operation of cervical cancer and endometrial cancer has the advantages of a good exposure of operational field,no need of the abdominal wall automatic retractor,a late and short abdominal interfere,the avoidance of adverse effects such as nausea,vomiting,blood pressure decreasing caused by operational exploratory and reduction of complications such as intestinal obstruction and intestine adhesion during and after operation,and adhere to the "F-outflanking cancer,"the operative principle,shorten the operation time.