Abstract: Grazing trail was conducted with Tan-sheep at Ningxia arid grassland during the period of May to October, 2003, the daily intake quantity, intake rate and herbage standing biomass were determined. The objectives of the trial were to determine grassland utilization rate so that the grasslands with the similar conditions could be utilized properly after a long term close. The results showed that the standing biomass was fluctuated during the grazing season. Grazing intensity had significantly effecs on the standing biomass both in quantity and date when it reached the peak. There was a significant negative correlation between daily feed intake of Tan-sheep and grazing intensity, and expressed as: y=2.04－0.54x(R²=－0.85,n=55),where y is daily intake and x is grazing intensity. During the grazing season, feed intake of Tan-sheep increased as it progessing and then decreased later, the intake also showed seasonal fluctuations. It suggested that the grassland utilization rate by grazing was 10%-15% under experimental conditions. In the practice grassland carrying capacity should be determined by the multifactors and can not solely decided by standing biomass.