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[Objective] To detect the mRNA of muscle insulin-like growth factorⅠ (IGF-Ⅰ) in the early development of Kazak sheep and Xinjiang fine-wool sheep, so as to provide information for the research about the early growth and development of sheep. [Method] With real-time quantitative PCR, the muscle IGF-Ⅰ mRNA level was separately detected in two varieties of sheep at 2, 30, 60, 90 and 120 days old. Then the data was analyzed with SPSS software. [Result] The IGF-Ⅰ mRNA in sheep muscle first increased and then decreased with ages, peaking at 30 days old in Kazak sheep and at 60 days old in Xinjiang fine-wool sheep. The IGF-Ⅰ expression level of Kazak sheep had no significant difference with Xinjiang fine-wool sheep at 2 or 90 days old (P>0.05), but was lower than that of the latter with extremely significant difference (P<0.01) from 30 to 60 days old. [Conclusion] The male Kazak sheep and Xinjiang fine-wool sheep have similar model of developmental changes of muscular IGF-Ⅰ mRNA, but the expression level is different between these two species.