The length of time one kidney can be removed depends on the function of the remaining kidney and is not generalizable. Some people are born with only one kidney and can live until they are 70-80 years old. Some patients have two kidneys but both kidneys fail and they can die sooner. Therefore, the survival of patients is not related to the number of kidneys, but to the function of the kidneys. After removal of one kidney, as long as the function of the remaining kidney is normal and can ensure the normal physiological function of the body, the patient’s survival is not affected; if there is a lesion in the remaining kidney, it is necessary to determine what kind of lesion it is and whether it will cause renal failure; if there is functional insufficiency of the remaining kidney, the patient’s prognosis is poor and can be life-threatening in the short term. After the removal of one side of the kidney, the remaining kidney needs to be better protected by avoiding late night, strenuous work, overeating, strenuous exercise, etc. and avoiding the application of nephrotoxic drugs.