There were compared with meat color,marbe,lose water ratio,water holding capacity,cooked meat ratio,muscle fiber diameter,shearing force which were showed that the calf yak meat color and marble are less than adult yak meat's,which were the significant difference.The calf cow's water holding capacity,the cooked meat ratio are higher than those of the adult yak,and the lose water ratio,the muscle fiber diameter,the shearing force are lower than the adult yak,which were shown that the calf beef meats' the quality was better than adult yak meat's.