To restore kidney function, first of all, it should be clarified what causes the kidney damage. If it is caused by prenephrosis such as insufficient blood perfusion, it is recommended to actively replenish blood volume, drink more water, and expand blood volume by intravenous fluids if necessary. If it is caused by obstruction, it is recommended to actively remove the obstructing factors, such as ureteral stones and ureteral occupancy, the obstruction can be removed by ureteral lithotripsy or pyelostomy to prevent the formation of chronic ones with irreversible consequences. If it is caused by chronic renal failure, first of all, we should avoid the emergence of aggravating factors, such as infection, further aggravation of the original disease, unstable control of blood sugar and blood pressure or application of nephrotoxic drugs, etc. We should actively cooperate with oral renal preservation drugs and actively perform renal replacement therapy if necessary.