When the 24h urinary citrate excretion is less than 320mg, it is called low citrate urine. Because microorganisms can decompose urinary citrate, the urine specimen to be measured should not be left for a long time, so as not to bias the results. The role of low citrate urine in the formation of calcium-containing kidney stones is gradually recognized. The incidence of low citrate urine in urolithiasis patients is 19%～63%. Low citrate urine examination Urine routine examination, when measured 24h urinary citrate excretion less than 320mg can be diagnosed as low citrate urine. Clinical and other imaging data found or suspected and renal area mass; renal area inflammatory lesions renal tuberculosis, hydronephrosis; renal injury; allergy to iodine, contraindication to imaging patients; guide renal area puncture biopsy, attraction and other interventional diagnostic measures. Recommended diet 1, eat more food containing vitamin A, C. 2, eat more fresh vegetables and fruits. Bitter melon: bitter melon is rich in vitamin C, do not eat too much at one time. Garlic seedlings: garlic seedlings contain chorine, its bactericidal ability can reach 1/10 of penicillin, pathogenic bacteria and parasites have a good killing effect, can play a role in the prevention of influenza, to prevent wound infections, the treatment of infectious diseases and the efficacy of deworming. Garlic seedlings should not be overcooked, so as not to spoil the chorine and reduce the bactericidal effect. Chicken liver: chicken liver is rich in vitamin A, maintaining normal growth and reproductive function. Animal liver should not be eaten with vitamin C, anticoagulant drugs, levodopa, eugenol and phenelzine and other drugs. Dietary contraindications: 1. Prohibit “thick-flavored” food. 2. 2. Prohibit all dairy products. Avoid food containing calcium oxalate. Pig large intestine: pig large intestine is cold in nature, sweet in taste; it has the effect of moistening the intestine, removing wind-heat in the lower Jiao, and stopping the number of urination. Less frequent urination is not conducive to stone removal. Cheese: dairy products Each kilogram of cheese products concentrated 10 kilograms of milk protein, calcium, etc.. Cheese contains more calcium. Cinnamon: Cinnamon is pungent, sweet and hot, and enters the kidney, spleen and bladder meridians. Do not consume it for urinary tract stones.