Patients with renal insufficiency should be given a low-protein diet according to the degree of renal decompensation, and attention should be paid to giving more high-quality protein.　　Low-protein diet has become an important part of non-dialysis therapy, and its efficacy has been confirmed by a large number of animal experiments and clinical studies. The main therapeutic mechanism is to increase the strength of the small arteries entering the glomerulus, reduce the high transmembrane pressure of the glomerulus, prevent the effect of systemic hypertension on the kidney, and restore the feedback of the glomerulus. Reducing dietary protein can reduce the amount of urinary protein to some extent, so it is worth advocating the early use of low protein diet for patients with renal insufficiency. Essential amino acids can be added if necessary.