Abstract: In this article, the ratio of C and N stable isotopes in human bones was analyzed to reconstruct diet and determine lifeway, mode of production and economic mode of ancient peoples who lived at the Dongheigou site, Ba Li-kun County, Xinjiang Autonomous Region. Stable isotopic analysis of 11 bone samples gives the following results: -17.74~-18.96‰ for δ13C and ?12.64~14.33‰ ?for ?δ15N. This data shows that the diet of these people included a large percent of meat and some C3 plants, which suggests an economic mode dominated by nomadism and supplemented by cultivating agriculture and hunting. Based on excavated animal and plant remains the food obtained from the pasture animals such as cattle and sheep or deer, and C3 plants such as barley and wheat. There was no difference in diet between males and females.

Key words: Nomadism; Dongheigou; Stable isotopes; Diet