Duanwu Festival in addition to eating dumplings, there are hanging mugwort leaves, wash mugwort custom. Hanging in front of the house is a folk behavior, in the south, the fifth day of the fifth month of the lunar calendar has been a very hot season, wash mugwort can play a summer, detoxification effect, with mugwort bath can play a role in preventing malaria, hang the mugwort leaves in the door, but also the use of mugwort leaves itself the smell of mosquitoes to smoke away. Mugwort in traditional Chinese medicine has the effect of eliminating summer heat, dampness, and on the Yin deficiency, fever also has a very obvious effect, for pregnant women during pregnancy with mugwort leaves bath can prevent the practice of postpartum wind.