Lymphocyst is one of the most common complications following pelvic lymphadenectomy in gynecological malignancies. Lymphocyst is mostly asymptomatic. But when it grows large, the pressure symptoms such as urinary tract obstruction and venous thrombosis of the lower limbs will have a great effect on the quality of patients' life. Some lymphocyst may cause secondary infection which will affect the follow-up treatment of patients. After analyzing the domestic and international development of research of lymphocyst with an objective discussion, this paper try to find a good way of diagnosis and prevention to reduce the incidence of lymphocyst.