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Lamadong Site, located near the Daling River Valley of west Liaoning Province, is the largest necropolis belonging to Sanyan Culture in North China up to now. The site dates back to late 3rd century to middle 4th, more specificly, it belongs to the period of Qianyan (337-370 AC) or a little before that period (from 289 to 337AC). Stable isotope and microelements analyses of human bones and tooth unearthed in the site could explore the palaeodiet of the ancestors, so that the communications between Cultures of Sanyan and Han could be conferred. Most samples of this site were found to be well preserved, and fit for palaeodiet analysis. The values of δ13C and δ15N of collagen showed that, these ancestors mainly rely on C4 plants and basically vegetarians. We deem this phenomenon is correlated with the developed millet agriculture then. The life style of Xianbei had already been strongly influenced by Han culture in Lamadong Site, they had totally changed their life styles from nomadic herding to settled farming. While sample BLM63 and BLM99 showed comparatve higher values of δ15N, it indicates that some meat was inüolüed in their diet. We also carried out t-test on palaeodiet analysis of different genders and different ages, and found there were no distinct differences. According to the results of microelements analysis, instead of being local residents, quite a part of Lamadong ancestors (42.1％) were found to be migrators within 7-10 years before one died. This finding corresponds well with the literatures which said a lot of refugees moved from Hebei into Liaoning during this period. We also carried out microscale analysis on one human tooth BLM363(T). Due to the observation under ESEM (Enüironment Scanning Electronic Microscope), we found the cycle of Perikymata of this individual was nine days. According to the estimation result of crown formation time, sample BLM363(T) had recorded the nutrition and growth conditions of this individual from 3 months after birth until 5 years old. We also found that during the period of 9 months to 5 years old the Ca and P content on his enamel had been increasing constantly, which means the concentration of hydroxyapatite (inorganic stuff) in enamel increased as one grow older. After analysis of Sr and Ba concentration in this sample, it is indicated that individual BLM363 did not migrate during the period of 9 months to 5 years old, at least we could know that his family was not a nomad family. Another thing worthy mention is that, the concentration of Zn in this tooth showed significant variation, and it is found to show an opposite trend of Ca variation. The reason why Zn acted like this was unknown.
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