If the cyst is too large and affects the kidney function, it can be treated by cyst puncture or surgery. If there is a cyst in the left kidney, if there are no other clinical symptoms and the laboratory tests are normal, no treatment is given and regular re-examination is sufficient, once in 0.5-1 year, and attention should be paid to protect the kidney function and prevent the use of food and drugs that aggravate the kidney burden. If the left kidney cyst ruptures and symptoms such as blood in urine, frequent urination, urgent urination and painful urination occur, anti-inflammatory and hemostatic drugs can be given for treatment. If the left kidney cyst is too large, with a diameter of more than 6 cm, causing discomfort in the back or impairment of kidney function, cyst puncture or surgery can be given.