Abstract: The polymorphism of adenosine deaminase (ADA) was analysed using the starch gel electrophoresis and specific staining in eight Han ethnic groups and minorities in China. The ADA2 frequencies of them are: Han(Harbin) 0.0386, Han(Chengdu) 0.0492, Han(Zhangzhou) 0.0240, Han(Guiyang) 0.0343, Han(Xi'an) 0.0302, Buyi (Zhenning) 0.0584, Yao(Bama) 0.0190, Hani(Yuanjiang) 0.0136. There is some regularity in the distribution of ADA' frequency.

Key words: Han ethnic group; Minority; Adenosine deaminase; Polymorphism