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Production of hair and undercoat, type of yak hair fibre, strength, stretched length and ultrastructure of the hair fibre were determined and observed for WY, DY and its offspring in this study. The results showed that hair yield of the 1/2 WY raised by 19.73% and the undercoat by 14% (P＜0. 01)more than that of the DY. Its strength improved 8. 31% (P＞0.05) more than that of the DY. The stretched length and the ultrastructure of hair fibre were resemblance in the WY and DY.