Abstract: The grazing trial with different grazing intensities was carried out in the grassland of Stipa grandis in Zhengxiangbai Banner of Xilingol League, Inner Mongolia from 2010 to 2012. The changes of the production performance of livestock in the grassland and dry matter digestibility in vitro of forages at different grazing intensities were studied. The results showed that the daily gain weight of cattle at different grazing intensities had significant difference （P〈0.05）and decreased with the increase of grazing intensity. Daily gain weight of cattle in unit hectare in MG area was significantly higher than that in LG area and HG area （P〈0.05）. The digestibility in vitro of forages in MG area was significantly higher than that in LG area at different grazing intensities （P〈0.05） and the digestibility in vitro of forages gradually decreased with the grazing time, When both livestock weight and the digestibility of forages were considered, the grazing intensity should be controlled within 0.35~0.40 per hektare.