Abstract: In order to study the effects of micro-ecological agent EM on the reproductive performance of Northern Shaanxi white cashmere goat,160 healthy 3.5-year-old ewes were divided into two groups,furthermore there was no significant difference in body weight of the two groups（P0.05） ,among them the tested group was fed with crushed dry corn straws which had been fermented by EM fluid,and the control was just fed with crushed dry corn straws without any treatment. Otherwise,all the basal diet was provided by Dingbian Sheep Farm of Shaanxi Province. After six months,oestrus rates of tested group and control group were 93.75% and 87.50%,respectively. Conception rates of tested group and control group were respectively 90.00% and 81.25%,among them the conception rate of tested group was 9.75% more than control. Lambing rates of tested group and control group were respectively 129.16% and 121.54%,while double-lamb rates were 21.51% and 17.72%,and the tested group was 14 lambs more than control. 92 lambs survived in the tested group,while 76 lambs survived in the control group,so the survival rate of tested group was 3.92% more than control,furthermore there was very significant difference in above indexes between tested group and control group（P0.01） . It is concluded that the oestrus rate,conception rate,lambing rate and survival rate of ewes could be improved obviously after they are fed with dry corn straws which had been fermented by EM fluid.