Objective The frequency of G6PD deficiency in the Tujia nationality in Jiangkou,Guizhou was investigated.Methods In Oct.2002,227 male subjects were selected randomly from the local people,and NBT qualitative and G6PD/6PGD quantitative methods were used to detect G6PD deficiency in them.Results Among the 227 subjects,17 cases of G6PD deficiency were found.The gene frequency of G6PD deficiency was 0.0749.Conclusion There is a high incidence of G6PD deficiency in Tujia nationality in Jiangkou,Guizhou.The investigation will illustrate the distribution of G6PD deficiency in Guizhou,and provide some useful data for the preventing G6PD deficiency,directing clinical management,improving minority population diathesis and studying the origin of Tujia nationality.