If the kidney cyst is less than 4cm in diameter, no obvious pressure on the renal pelvis and calyces, no infection, malignancy, hypertension, or no obvious symptoms, only close follow-up observation and regular B ultrasound review are required. (A) Puncture and fluid release + sclerotherapy 1. Indications This method is suitable for patients with cyst diameter greater than 4cm, with symptoms, and infection of malignant changes excluded by examination. 2, commonly used sclerosing agent, tetracycline, phosphate lock, 95% alcohol, 50% glucose. 3.Contraindications Patients with local skin infection, patients with serious bleeding tendency. 4, complications bleeding, infection, hemopneumothorax, kidney lacerations, arteriovenous fistula, injury urinary cysts and sclerosing agent extravasation on the perirenal tissue irritation and damage. (B) Puncture and release of fluid plus antibiotic treatment 1. Indications Renal cyst combined with intracapsular infection when the diameter is large and dry 4cm. After the ultrasound-guided puncture and fluid release, sensitive antibiotics will be injected according to the possible strains of infection. 2, contraindications and complications are the same as puncture plus sclerotherapy. (C) Surgical treatment 1. Indications (methods include open surgery and laparoscopy) (1) Cyst co-infection and failure of puncture and fluid release plus antibiotic treatment. (2) Malignant transformation of cyst. (3) Puncture plus sclerotherapy for insomnia. (4)Giant renal cyst. 2. Contraindications Severe cardiopulmonary, hepatic and renal dysfunction cannot tolerate surgery, and cyst malignant change with distant metastasis. 3.Selecting the operation style (1)cyst debulking, which is suitable for most patients with renal cyst; (2)nephrectomy, which is suitable for malignant change of cyst or cystic kidney cancer. 4. Postoperative complications are often infection, bleeding, and urinary fistula. The anti-complications after laparoscopy are gas check, subcutaneous and mediastinal emphysema, bleeding from intestinal tube injury, infection, etc.