The key to preventing uric acid stones is to increase urine volume, raise the pH of urine and reduce the formation and excretion of uric acid in 3 ways. (1) Drink a lot of water: keep the daily urine volume above 2000ml. (2) Alkalinize urine: maintain the pH of urine between 6.5 and 6.8. You can give sodium potassium hydrogen citrate (Yolite) 1~2g, 3 times/d, potassium citrate 2~3g or sodium potassium citrate 3~6g, 2~3 times/d, or sodium bicarbonate 1.0g, 3 times/d. (3) Reduce the formation of uric acid: for increased blood uric acid or uric acid, take 300mg/d of allopurinol orally. Folic acid can inhibit xanthine oxidase activity more effectively than allopurinol. 5mg/d of oral folic acid is recommended.