Xiangyun yarn, whose real name is yam and yam silk, is a general term for yam and yam silk. Beijing is called yam. It is an ancient plant-dyed fabric hand-woven and dyed by Han people in Guangdong, with a history of 100 years. Because of its unique production technology, it is rare in quantity, long in production time and exquisite in skill, and has the characteristics of smoothness, coolness, sterilization, insect repellent and health care for the skin. It used to be called soft gold because the coating slowly fell off after wearing it. It is a silk fabric dyed by pure plants and minerals in the world textiles at present. In 1970s, due to the change of social wearing habits and the entry of foreign textiles into the market, yam gradually disappeared. It was not until 20 10 that Su Xian Dafeng reappeared the yam that had disappeared for nearly 30 years in Nanhai Heshun.