Retroperitoneal cystic space needs to be analyzed according to the nature of the cyst, and clinical symptoms, choose a specific treatment plan, can choose conservative treatment and surgical treatment. 1. Conservative treatment. Conservative treatment is generally used for benign retroperitoneal cystic occupations with a diameter of ≤5cm. (1) If the patient has no obvious symptoms, there is no need for special treatment, and it is recommended that the patient go to the hospital for regular physical examination to review the growth of the cyst. (2) If the patient experiences discomfort such as swelling and pain, the fluid can be extracted by a specialized doctor to relieve the symptoms. 2. Surgical treatment. Surgery is generally used for benign retroperitoneal cystic occupations with a diameter of >5cm, or malignant retroperitoneal cystic occupations, which need to go to the hospital in time for surgical removal of the cysts, so as to avoid deterioration of larger cysts or further development of malignant cysts. For malignant cystic occupations, postoperative chemotherapy (e.g., 5-FU, vincristine, etc.) and other follow-up treatments are also needed. It is recommended to go to the hospital in time after the discovery of retroperitoneal cystic space, complete the cyst pathology biopsy and other related examinations, and then choose the appropriate treatment plan according to the results.