Abstract: Content and distribution type of Fe,Mn,Zn,Cu,Co,Mo,Se,in 6 subtypes among of 4 types of grassland in Alxa were studied with 75 herbage samples and 25 soil samples,and content of trace element were estimated in herbage of various subtypes of grassland.The result showed that there was normal content of Se in flat Gobi,foothill slope,low land and Cu,Zn in coldemperate-humid type,lower in the other subypes or types than the average content of normal soil in China and in World.Deficiency of trace elements was correlative to soilforming rock.The content of trace elements in herbage had a certain extension in despite of complex climate,soil and other ecological condition in Alxa,which was correlative to the ability of herbage to absorb and accumulate trace elements.

Key words: desert grassland, soil, herbage, trace element, Alxa