The ten-year recurrence rate of calcium oxalate stones is close to 50-60%, for which it is crucial to take targeted preventive measures to control stone recurrence. Prevention suggestions: 1. Drink plenty of water Drink at least 2000ml of water daily (equivalent to a thermos bottle) to ensure that the daily urine volume is more than 2000ml. 2.Limit sodium salt Sodium salt can cause increased urinary calcium excretion, so daily consumption of sodium chloride (salt) should not exceed 5 grams, avoid eating MSG, chicken essence. 3, avoid eating oxalic acid high oxalic acid food mainly includes amaranth, spinach, rhubarb, mango, strawberries, sesame, cocoa, chocolate, tea, various nuts (chestnuts, almonds, walnuts, etc.), should be avoided or eat less. 4, often eat citrus eating citrus fruits can increase the urinary citrate (stone inhibition factor) content, help prevent the recurrence of stones. 5, moderate exercise is conducive to the discharge of small stones, but should prevent excessive exercise leads to dehydration caused by urine concentration. 6.Control weight Obesity can easily lead to stone formation, so obese people should reduce their weight. 7.Regular physical examination The urological ultrasound should be routinely reviewed every year.