The patient has diarrhea and watery but no stomach pain, it is likely to be functional diarrhea, which is related to rapid intestinal peristalsis, intestinal contents are excreted without being completely absorbed, there may be digestive enzyme deficiency or intestinal flora imbalance, etc., need to laboratory stool routine plus ion biochemistry and other tests to clarify. If the stool routine excludes intestinal infection, it can be treated with Desutex plus rectified intestine plus montelukast. If the patient has active bowel sounds and rapid bowel movements, he can also be treated with 654-2 antispasmodic therapy. In addition, if the blood test reveals low potassium or sodium in the ion biochemistry, the patient needs to be given fluids to replenish water, ions, potassium and sodium.