The staging method of chronic renal failure in China can be traced back to the minutes of the Huangshan Conference in 1992, when chronic renal failure was divided into 4 stages, and we have been using this staging method now. The first stage, renal function compensation stage, the laboratory blood creatinine is between 133-177 μmol/L. The second stage, renal function decompensation stage, has a laboratory blood creatinine between 186-442 μmol/L. The third stage, renal failure stage, is also known as pre-uremic stage, the blood creatinine is between 451-707μmol/L. In the fourth stage, uremic phase, the blood creatinine is ≥707μmol/L.