Fine hybrid lambs of similar birth date and weight was selected in the experiment.Results indicated that under local climate conditions during May to July and specific management,crude protein level influenced 9.31 kg of lamb weight,accounting for 40.63% of total effect,so it is main factor.Metabolizing energy influenced 8.66 kg,accounting for 37.78% of total effect,and it is second factor.At a certain level of metabolizing energy and crude protein,the types of crude feeds influenced 1.71 kg,accounts for 7.46% of total effect,so it is subordinate factor.But fattening effect of complete stool maize ensiling was obvious better than other crude feeds,and there were not significant difference among other crude feeds.