The Dungans are Muslims who fled China for Russian territory in Central Asia after the failure of the Dungan Revolt (1862-1877). Their language, which UNESCO classifies as "definitely endangered," is related to northwestern Mandarin Chinese. Dungan has two main dialects: the so-called Gansu dialect, which is similar to the Muslim Chinese communal dialects in the southern part of the province of Xinjiang, and the Shaanxi dialect, which has more in common with the dialects of southern Shaanxi around Xi'an. In the Soviet Union an alphabetic orthography and a literary language was developed for the Gansu dialect. Dungan is interesting for Chinese studies because it has an alphabetic orthography. It is also important because it shows very little influence from the Chinese literary language. It has preserved original features of the local dialects of about 150 years ago. It also has loans from Persian and Arabic, from Turkic languages, and from Russian. Although Dungan is now spoken primarily outside of China and employs an alphabet rather than Chinese characters, it is not really a peripheral dialect of Chinese. The Dungan Revolt started near Xi'an, Shaanxi, the cradle of the Chinese civilization and a frequent site of the capital of the country. (This is where the terracotta soldiers were buried.) The speakers that gave rise to Gansu Dungan came from a place west of the Shaanxi speakers, but still a totally Chinese-speaking area. This dictionary is based on words and examples collected from Dungan-language newspapers and books published before the fall of the Soviet Union. Special attention has been paid to not only vocabulary (9,945 headwords) but also grammatical features; the dictionary may even provide material for the study of syntax. An effort has been made to find characters for Dungan words in dialect dictionaries published in China.