Abstract: Fattening trial of hybrid Dorset lambs and local native lambs was performed.The weight gain of the hybrid Dorset lambs was 11.70 kg,the daily weight gain of the hybrid Dorset lambs was 146.25 g,44.37% higher than that of the local native lambs.The feed conversion ratios of the hybrid Dorset lambs and local native lambs were 7.05：1 and 9.65：1,respectively.The carcass weight of the hybrid Dorset lambs and local native lambs were 14.30 and 10.96 kg,respectively,and their dressing percentages were 47.67% and 44.38%,respectively.Therefore,effect of hybridization was obvious.The economic benefit of the hybrid Dorset lambs was 42.92 Yuan more than that of the local native lambs.