The environmental capacity (which mainly refers to carrying capacity) of the grassland,as rare resources, has been dwindling dispite a lot of administrative measures in recent years.The situation of "the part takes a favorable turn,the overall situation worsens" of the ecology of grassland has not changed at all.It seems hard to carry on the tra- ditional management style.Pasture permit trading mechanism can solve overloading problems caused by grassland eco- logical environment externality etc,which ean be solved through the marketing meehanism while being difficult original- ly,and can not merely control the domestic animal amount in year and optimize the disposition of meadows resources ef- fectively,and also can save a large number of social supervision and transaction cost.