Magnesium ammonium phosphate hexahydrate stones are infected stones, the ten-year recurrence rate is about 40% to 50%. Prevention suggestions: 1, drink a lot of water drink at least 2000ml of water daily (equivalent to a warm bottle), to ensure that the daily urine volume of 2000ml or more, it is best to drink acidic beverages, conducive to urine acidification, can drink plum fruit, apple juice, cranberry juice; but it should be noted that magnesium ammonium phosphate stones are easy to form in alkaline urine, so should not drink alkaline beverages (such as orange juice, cola, etc.), so as not to cause alkalinization of urine 2, moderate exercise is conducive to the discharge of tiny stones, but should prevent excessive exercise leads to dehydration caused by urine concentration; 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, control infection pay attention to personal hygiene, to prevent urinary tract infection, according to the urine culture results 5.Avoid cold especially in the kidney area, bladder area and feet; 6.Regular physical examination Every three months should be routinely re-examined urinary routine and urinary ultrasound.