Abstract:The commercial standards of Dendrobium medicinal materials in Yunnan are very complieated, 1. The prineipal commodities of these materials include:①Xi-fengdou(spiral Dendrobium): They are divided into three classes, i.e. 1,2 and 3, but recently Diaolan-fengdou (rough spiral Dendrobium) was discovered. ②Huangcao (yellow herb Dendrobium): They are classified as Xi-huangcao (slender Dendrobium), Cu-huangcao (thick Dendrobium), Bian-huangcao (oblet Dendrobium),Xiaogua(?)uangcao(littlemelon Deudrobium)and Xian-huangcao(freshly Dendrobium). 2. nonprincipal Huangcao commodities in Yunnan include: Cha-huangcao (branch Dendrobium), Xianggun-huangcao (stick Dendrobium) and Yougua-huangcao (melon Dendrobium).