Hydrocephalus renal function left 10% can be recovered depends on the length of time caused by kidney damage, such as short time of illness, timely treatment or can be recovered, such as long time and untimely treatment, usually not easy to recover. 1. Short time: patients should pay attention to personal diet and control sodium intake. You can actively cooperate with the treatment, after ultrasound, urography and other examinations in the urology department, according to the results of the examination in the hospital for treatment. 2. Long time: it is hard to recover from the damage done to the kidneys of patients who have hydronephrosis for a long time, and they can only try to control its progress and slow down the process of chronic renal insufficiency. Hydronephrosis is mainly treated according to its causes, which include urinary stones such as renal pelvis stones, genitourinary tumors, prostate hyperplasia, congenital developmental anomalies such as ureteral junction stenosis, tumor invasion of neighboring organs such as colorectal cancer, tuberculosis secondary ureteral stenosis, as well as other conditions such as trauma, radiotherapy, and so on. Patients with hydronephrosis with 10% of renal function left need to go to regular hospitals for examination and diagnosis, and under the guidance of doctors to avoid delays.