Low molecular proteinuria is due to the filtration of the glomerular filtration membrane and the reabsorption of the renal tubules, the amount of protein (mostly proteins with small molecular weight) in the urine of healthy people is very small (less than 150 mg excreted daily), and the protein qualitative examination is negative. It is caused by the impairment of renal tubular function, so that the protein reabsorption via normal glomerular filtration is impaired. Low molecular protein generally refers to proteins with a molecular weight of 40,000 d. Because the renal tubules play an important role in the reabsorption and catabolism of low-molecular protein, the excretion of low-molecular protein urine increases in renal tubular lesions. Dietary precautions 1, it is appropriate to eat clear and easy to digest food, avoid seafood, beef, mutton, spicy and stimulating food, wine. 2, it is advisable to eat fresh vegetables and moderate amount of fruit, moderate amount of water, low sugar, low fat. 3, all patients with kidney disease prohibit streptomycin, gentamicin, butylamine kanamycin and other nephrotoxic drugs, traditional Chinese medicine drugs such as mucuna pruriens, green mucuna pruriens and other aristolochic acid drugs. 4. Those with edema should limit salt and drink less water. If edema is not heavy, low-sodium salt diet is allowed. No edema does not limit the amount of water and protein food intake, with hematuria yin deficiency fire should not use tonic drugs.