Abstract: The genetic structure of 22 ethnic groups in China was analysed by using gene frequency data of red cell blood groups. The Harpending and Jenkins (1973) topological methods of representing population structure were applied to the study on relationship between these ethnic groups. The plots of these ethnic groups showed clearly the gene flow between Caucasian and Mongoloid and between northern Mongoloid populations and southern ones.

Key words: Genetic structure of population; Genetic distance; Principal coordinate analysis