Abstract: The aim of the present study was to assess the dietary nutrition levels on reproductive performance of yard feeding female Tan Sheep. The variation of the weight of yard feeding female sheep in different stages of reproductive period was characterized;the serous nitrogen content and hormones content of yard feeding females were determined and were statistically compared with that of rotational grazing females;the main indicators associated with reproductive performance of the yard feeding and rotational grazing females were recorded and compared. The results revealed that the daily weight gain of yard feeding females during early gestation and late gestation was 40.56 g and 19.33 g respectively, and the weight of them during lactation was lost 53.17 g daily; during the whole reproductive period, the serous TP content of yard feeding females was higher than that of rotational grazing females, but contrary results were observed in serous SUN content;during non-pregnancy, late gestation and lactation, the serous E2 content of yard feeding females was higher than that of rotational grazing females, and the serous LH content of rotational grazing females was higher than that of yard feeding females during late gestation and lactation; the reproductive and survival rate of yard feeding females was higher than that of rotational grazing females, and the ration of yard feeding females which produced two lambs per year accounting for all yard feeding females was higher than that of rotational grazing females. The results of this study suggest that the optimization of supply level of dietary energy and protein is able to effectively improve the reproductive performance of Tan Sheep.