Abstract: BMP15 gene played an important role on many links of the reproductive process of female such as follicular development,selection of advantage follicular and ovulation,so the expression status of mRNA coded by BMP15 gene in ovary,uterus,oviduct and kidney of Mongolian cattle was detected by RT-PCR technology in this research. The results showed that BMP15 gene was expressed in all the 4 tissues,but its expression abundances in different tissues were different. The mRNA level of BMP15 gene in the ovary of Mongolian cattle was extremely significantly higher than that in their uterus （P〈0.01）and significantly higher than that in their kidneys （P〈0.05）. It was indicated that the expression abundance of BMP15 gene was higher in ovary and oviduct and lower in uterus and kidney.