Breeding ewes generally choose individual large, good milk quality, adaptability of local sheep or goat breeds as the basis of the ewes, breeding rams are selected fast growth rate, high meat rate, good function, resistance to rough feeding of sheep breeds as the parent, give full play to the advantages of sheep crossbreeding improvement. Commonly used as breeding ewes of sheep breeds are small-tailed cold sheep, lake sheep, etc., the main choice of breeding rams Dupo sheep, Suffolk sheep, etc.; Dupo sheep, for example, its early growth rate, meat quality, and long-term heat, in recent years in the country is highly favored.