Foot bath health can be divided into hot water foot bath and cold water foot bath, and everyone can choose according to their own situation. The water temperature should be gradually reduced, generally from 20℃ to 4℃, and feet can be soaked in cold water from autumn to winter. Before each foot bath, rub your feet with your hands to warm them up, then soak your feet in cold water and rub them with each other until your feet are flush. About 5 minutes each time, just do it once in the morning and once in the evening. Cold water foot bath not only makes the blood vessels in the foot contract strongly, but also makes the physiological functions of all systems in the whole body active under the regulation of neurohumors. Cold water bath can also increase the temperature of nasal mucosa, enhance respiratory resistance and prevent colds in winter. However, it should be noted that it should be dried and kept warm immediately after a cold bath.