Abstract: The comparison on the yields and qualities of 5 vsrities of grass family forage was conducted two clipping ways in irrigated fields in Xiliaohe plain in inner Mongolia,from May to Sepember,2002.The results showed,The fodder yield of Jumbo and Superdan clipped twice was higher than those of once especcticely.However,Sugargraze,Runbao and Dalishi is opposite.In yield of hay ,All of them that were cilpped once are higher than that of twice.As the affect of crude protein content,Jumbo, Superdan and Dalishi that was clipped twice is higher than once in yield of crude protein.However,Sugargraze ,Runbao are opposite.Considered yields and qualities with twice clipping fit green chop while Jumbo and Superdan ,Runbao fit silage.