The duration of foot soak is generally controlled at 20-30 minutes, with slight sweating around the body is best. Foot soak is the most common health program in China, simple to implement, and has the effect of promoting blood circulation, facilitate sleep and so on. The best length of foot soak for 20-30 minutes, the water temperature should not be too hot, preferably controlled at about 40 ℃. Foot soak not more than 20 minutes may not play its due health effects, but foot soak for too long, but also inappropriate, may lead to prolonged expansion of blood vessels, but also easy to soak off the skin. Foot soak is good, both young and old, but some people are not suitable for foot soak or foot soak use to pay special attention, such as foot trauma people, if the foot soak may lead to wound infection; infants and children with delicate skin, not suitable for foot soak; people with diabetes to control the water temperature, because some diabetic patients peripheral nerve insensitive, easy to burn; the elderly foot soak for a long time may lead to sweating, panic, to pay attention to control time. Soak feet to be different from person to person, find their own time, while paying attention to water temperature, personal hygiene, etc..