Shanzhecai, also known as Yang Guo moss, is a rare and precious natural green food in China. It has been processed and planted locally for hundreds of years. During the reign of Kangxi and Qianlong in the Qing Dynasty, it was included in the palace as a tribute, and Gang was also called "tribute food". 1958, when Premier Zhou tasted this dish, he named it "Xiangcai" because of its crisp sound. 1983 was first exported to Japan, South Korea and other Southeast Asian countries. It tastes like a jellyfish and is famous as the "mother of mountains and rivers" overseas. Since 1985, dried moss in Yang Guo has won many domestic and international exhibition awards. 1986 won the best-selling goods in Shenzhen Fair; 1988 won the gold medal of Beijing Agricultural Expo; 199 1 was listed by the Ministry of agriculture and the Ministry of finance as the largest famous and excellent project in China during the eighth five-year plan period. 1992 won the special prize of Hong Kong International Food Expo. 1995 was listed as a "special tribute" for the 4th Beijing World Expo, and Guoyang County was named as "the hometown of dried moss (tribute) in China" by the state. 1999 was rated as an Anhui product and a national famous brand product, and its "Easy Door Number" and "Zhenyuan Brand" dried moss were successively named as "green products" by the state.