Yak is a special livestock distributed in Qinhai-Tibet plateau and circumjacent districts.For a long time,yak industry has an extensive management and low production performance.Datong bull farm imported wild yak gene to modify domestic yak,and successfully cultivated a new yak breed-Datong yak,which was the first yak variety in the world.A series of comprehensive technical measures were implemented,which had a positive effect on yak industry development.