Huangdi Neijing holds that "meridians are born by people and diseases are caused by people"; In the "Foot Heart" written by Hua Tuo, a physician in the Eastern Han Dynasty, there is also "soaking feet to raise the sun in spring; Soaking feet in summer can dispel heat and dampness; Soak your feet, moisten your lungs and moisten your intestines in autumn; According to "soaking feet in winter in Dantian", Bama, the hometown of longevity in Guangxi, has a folk proverb that "it is better to soak feet before going to bed than to eat a sheep for three days". Research shows that 30 minutes of health foot bath before going to bed is more suitable for middle-aged and elderly people than pure hot water foot bath.