Urine specific gravity measurement is used to estimate the concentration function of the kidneys, but its accuracy is poor and is influenced by many factors. Its measurement value is for reference only. Decreased urine specific gravity is seen in urolithiasis, chronic nephritis, etc. Chronic nephritis is a group of glomerular diseases with multiple etiologies of chronic glomerular lesions, but the cause is unknown in most patients, and there is no clear relationship with streptococcal infection, according to statistics, only 15-20% are transformed from acute glomerulonephritis, but because the subclinical type of acute glomerulonephritis is not easily diagnosed, the percentage may actually be higher. In addition, most patients with chronic nephritis do not have a history of acute nephritis, so more scholars now believe that there is no definite association between chronic glomerulonephritis and acute nephritis, which may be caused by various bacterial, viral or protozoal infections through immune mechanisms, inflammatory mediators and non-immune mechanisms. Dietary therapy for decreased urine specific gravity: 1, ginseng soup to ginseng (or American ginseng) 6g plus cinnamon meat 10, boiled internally, for chronic renal insufficiency patients with anemia, palpitations and palpitations, has the effect of nourishing blood and calming the mind. 2.Ginseng and Jujube Soup Take 6g of ginseng (or American ginseng) and 6 red dates, boil them together and take internally. It has the effect of raising hemoglobin for anemic patients with chronic renal insufficiency. 3.Congee: Boil millet, jujube, adzuki bean and yam (fresh) in appropriate amount, add water to make porridge, add alkali when boiling. Taken regularly, chronic renal failure patients with anemia to take, has the effect of strengthening the spleen and water, and stomach nourishing blood. 4, mulberry honey paste to fresh mulberry 100g (or dried 500g), thick decoction, add honey 250g, used for chronic renal insufficiency of kidney yin, insomnia and irritability. 5.Five Juice Drink Fresh lotus root can clear heat and cool the blood, fresh pear can clear the heart, moisten the lung and dissolve phlegm, fresh raw earth can clear heat and cool the blood, and raw sugar cane can help the spleen and strengthen the stomach. 500g of each of the above products, chopped and wrung with sterilized gauze, is used for chronic renal insufficiency patients with nosebleeds, divided into 2-3 doses.