Whether hemodialysis can restore renal function depends mainly on the cause of dialysis. If it is acute renal failure, renal function may be restored after correcting reversible factors and combined with hemodialysis treatment; if it is chronic renal failure, irreversible damage to renal function has already occurred, and hemodialysis usually cannot restore renal function. In case of acute renal failure, it may be due to diarrhea, acute obstructive and other causes. The blood creatinine appears to be obviously elevated, hyperkalemia which cannot be corrected by medical treatment, heart failure, severe metabolic acidosis, etc. At this time, hemodialysis is needed, and after correcting reversible factors such as replenishing fluids and relieving obstruction, the blood creatinine will gradually decrease and the renal function may be restored. In case of chronic renal failure, the purpose of hemodialysis is to maintain the stability of the internal environment and prevent complications such as heart failure and respiratory failure. After sufficient dialysis, blood creatinine will gradually decline and stabilize to a certain degree, but irreversible damage to renal function has occurred and renal function usually cannot be restored. If the patient has abnormal kidney function, it is recommended to go to regular hospitals in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.