Patients with kidney stones can eat watermelon, which contains a large amount of water and certain sugar. After eating watermelon, there will be a brief promotion of diuretic effect, and a large amount of urine will be excreted. After eating watermelon, a large amount of water can be replenished to reduce the concentration in urine and avoid the effect of urine concentration or urine supersaturation that can lead to stone formation. Therefore, patients with kidney stones can eat more watermelon appropriately. The most effective way for stone prevention is also to drink more water and urinate more often. Eating watermelon can replenish water and produce more urine to prevent the occurrence of stones. The factors of stone formation are: 1) excessive concentration of urine, the tangible substances in the urine, precipitation to become stones. 2) chronic urinary tract infection, that is, the occurrence of infectious stones, and sometimes bacteria can also become stone condensation nodules, leading to the occurrence of stones. 3) some metabolic factors, such as hyperuricemia, can lead to the formation of uric acid stones. These need to carry out the usual drink more water, pay attention to hydration to prevent the occurrence of stones. Therefore, the consumption of watermelon can also play a positive role in the prevention of stones.