Creatinine clearance represents the glomerular filtration rate to some extent and reflects the good or bad kidney function, so the glomerular filtration rate is judged clinically by relying on gender, age, body weight and the measured blood creatinine value. The formula is (140 – age) x weight / 0.818 / blood creatinine value, and the unit of creatinine is μmol/L. By checking these values, the kidney function can be indirectly assessed. The normal glomerular filtration rate is 80-120 ml/min, if the glomerular filtration rate is low, it often means that the kidney function is impaired, further examination of urinary routine, urine protein quantification, or even renal puncture to clarify the type of pathology to further understand the cause of impaired kidney function, clear causes after the targeted drug treatment. The common causes are chronic nephritis, hypertensive kidney damage, diabetic nephropathy and so on. The main treatment is to apply drugs to protect the kidneys, such as Bailing capsules, and to control blood pressure, blood sugar and blood lipids to reduce urine protein and delay the deterioration of kidney function.