本文从敦煌文献中的mdogams这一地理名词着手 ,认为该词后因语音的演变等因素 ,演变成元代的mdokhams(朵甘思 )。明代初期 ,藏族又出现多康三岗 (mdokhamssganggsum)等地理概念 ,朵甘思仅为其三岗之一 ,因此朵甘思和多康是两个地理概念。但因后期藏文文献中多康与朵甘思选用同一个词mdokhams来表达 ,从而在一定程度上误导了近现代的研究者 ,在mdokhams一词单独出现时 ,稍有不察 ,便容易产生歧义 ,乃至认为mdokhams有广义与狭义两种概念 This article starts with the mdogams, a geographical term in Dunhuang literary texts, and thinks that the word evolves into the mdokhams of the Yuan Dynasty due to factors such as phonetic evolution. In the early Ming Dynasty, Tibet also saw the geographical concept of Dokang Sogang (mdokhamssganggsum). Only Duogansi was one of its three posts. Therefore, Dorcan and Dokkang are two geographical concepts. However, in the late Tibetan literature Dukang and Duogan use the same word mdokhams to express, thus to a certain extent, misleading the modern researchers, when the word mdokhams appeared alone, a little underestimated, it is easy to produce Ambiguity, and even think mdokhams have broad and narrow two concepts