Many experiments show that Chinese herbal medicines such as Rhizoma Osmundae, Rest, Rhizoma Atractylodis and Folium Artemisiae Argyi can prevent diseases and plagues after burning, and the air sterilization rate is over 93%. Zhang Zhongjing of the Han Dynasty burned Atractylodes lancea and pig's trotters together, which is said to ward off evil spirits. At the same time, through a number of medical certificates, it has obvious curative effect on improving human sleep, removing blood stasis and promoting blood circulation, invigorating spirit and improving immunity.