Abstract: To detect possible gene flow from west Eurasia, the Eurasian racial characters are examined and the Average Frequencies of Eurasian Racial Characters (AFOERC) are calculated for modern cranial samples from North China and Yunnan. The results show that: 1) Eurasian racial characters can be found in the samples from North China and from Yunnan as well; 2) The AFOERC of North China sample is not higher than that of ancient sample of Yin Dynasty, which indicates that there were not more Western genes flowed into the population of North China in the last 3000 years; 3) The AFOERC in Yunnan sample is much lower than in the sample from North China, which may be a result of gene exchange between Yunnan and local surrounding populations.

Key words: Modern human crania; Eurasian Racial Characters; Gene flow; North China; Yunnan