Abstract: The phenotype and allele distribution of ABO blood groups in Bouyei, Miao and Sui populations in Qiannan Autonomous Prefecture were investigated. Results showed that the phenotype distribution of these blood groups in the Bouyei population was O > B > A > AB, while it was O > A >B > AB[ spacing made consistent ] in Miao and Sui populations. Allele frequency of ABO blood groups in the Bouyei population was similar to that in Miao and Sui groups, and the distribution of phenotypes in all three populations was in accordance with the Hardy-Weinberg equilibrium. Distribution of ABO blood group phenotypes between peoples in: the Qiannan region and the Qiandongnan region; the Bouyei and Miao populations in the Qianxian area; and in men and women of the Sui population in Qiannan region were significantly different ( P < 0105) . These results suggest that there are differences in the distribution of the phenotype of ABO blood group among populations of different nationalities , gender and in different regions.

Key words: ABO blood groups; Gene frequency; Bouyei; Miao; Sui; Qiannan