The selective low protein dietary in treatment of chronic renal failure aims at objectives in cluding reduction of symptom of hyperuremia and protection of function of rest normal kidney. However, the limitation of daily protein need will lead to lack of essential aminoacide. Use of ketoacid corresponding with aminoacid reduces the nitrogen supply, prevents the bad progress of chronic renal failure and limits the excessive filtration of glomerular, hyperphosphatemia and secondary increased para- thyroid function.