Abstract: As an important method of physical anthropological study, body mass estimation provide a new approach to understand the body shape of ancient population. Based on the approaches of biomechanical and morphometric, four different formulae which based on different populations were used. This paper describes the research on body mass estimation of 34 skeletal samples of Warring States period unearthed from Tuchengzi cemetery in Inner Mongolia in 2005. Through statistic analysis, the result shows that the average body mass of Tuchengzi in male is 67.21kg, while the result in female is 54.63kg, there exists a significant difference between genders. Comparing with the data of Jinggouzi, an ancient population lived simultaneously in the same region, the average body mass of Tuchengzi group is much heavier than the Jinggouzi group, so does the distribution in the whole population while the difference in female group is not significant. Combining with the result of archaeological and historical research, it supports the verdict that the Tuchengzi population is guarder who were guarding city there.

Key words: Helingeer county; Tuchengzi site; Warring States period；Body mass; Guarder