For hydronephrosis, if the condition is not serious, there is a need to preserve the kidney; if the condition is serious, it is recommended to receive resection treatment. 1. Mild condition: If the renal parenchyma is still remaining and the glomerular filtration rate is still good, it is generally recommended that the patient retains the kidney, at this time, the kidney can still play a certain function, and there is no need for resection. 2. Serious condition: if the renal parenchyma is thin, this condition generally belongs to severe hydronephrosis, you need to receive CT scanning examination of the kidney to determine the thickness of the renal parenchyma, you can receive fistula drainage, if the renal parenchyma is significantly atrophied, causing renal hypertension or combined with severe infection, severe loss of renal function, and the opposite side of the kidney function is normal, you can cut off the affected kidney. It is recommended that patients with hydronephrosis consult regular hospitals and standardize treatment under the guidance of physicians.