Minimally invasive kidney stone requires staged treatment, which is often seen in larger kidney stones or a larger number of stones. If minimally invasive surgery is performed, the operation time may be longer, and the longer the operation time is, the greater the risk to the patient, so in order to control the operation time and reduce the risk of the patient’s operation, staged surgical treatment is needed for the larger stones or stones with multiple occurrences. The first phase will remove half of the stones first, and then the second phase will remove the remaining half of the stones, so as to achieve the minimally invasive effect, to achieve the effect of stone removal, but also to ensure the safety of the patients during the operation, because all kinds of minimally invasive surgery, in the process of the surgery needs to be carried out in the saline continuous perfusion and rinsing, the longer the operation time will be the higher the pressure inside the renal pelvis, the greater the damage to the kidneys or the longer the operation time will be, the greater the risk to the patients, the anesthesia and the surgery itself will be the same, the patient will have to bear the risk of the operation. The longer the operation time, the higher the pressure in the renal pelvis, the greater the damage to the kidneys, or the longer the operation time, the greater the risk of anesthesia and the operation itself that the patient endures, and the prolonged perfusion can lead to dilutional hyponatremia in the patient, which can lead to the spread of infection in the patient, and can lead to the risk of bacteremia or acute heart failure. Therefore, in order to ensure the safety of the patient during the operation, it is necessary to perform the operation in two stages if necessary for large or multiple stones.