Abstract: Objective and MethodForty Xinjiang Brown Cattles were selected and divided into 4 groups:control group,test group 1,test group 2 and test group 3,which were fed with supplementary feeding by 0 kg/day/head,1.0 kg/day/head, 1.5 kg/day/head and 2.0 kg/day/head respectively.Effect of low-quality grazing pasture and supplements on Xinjiang Brown Cattle production performance was studied in the experiment.ResultResults showed that the supplementary concentrated feed could increase milk production of Xinjiang Brown Cattle under the low quality grazing pasture conditions,it could inhibit the declining of milk production after high lactation period.ConclusionSupplementary feeding had no effect on lactoalbumin,batterfat rate and milk sugar when it was given.