By using ultrasonic in vivo, meat quality traits of adult Xinjiang brown cattle were determined, in-cluding the eye height（x1）, back-fat thickness（x2）, eye muscle area（x3）, body weight（x4）, body height（x5）, bodylength（x6）, chest circumference（X7）, the circumference（x8）, as well as the weight of each part after slaughtering.On this basis, the correlation of the meat quality traits, body weight and body size with high-grade meat weight（Y1）,the back part meat weight（Y2）, high quality meat weight（Y3）, all cut weight of Xinjiang brown cattle（Y4） were ana-lyzed and the optimal regression equation established. The results showed that carcass back-fat thickness, loin eyearea and body weight affected the high-grade meat weight. Body weight, body height and chest circumference had aremarkable impact on back part meat weight of carcass. The eye muscle area, body weight, body height and chest cir-cumference affected the weight of quality meat and all cut weight of Xinjiang brown cattle. The optimum regressionequation of Xinjiang brown cattle high-grade meat weight, the back part meat weight, high quality meat, all cutweight of meat, and meat quality traits, body weight, body sizes were as follow: y₁=6.34 x₂+0.141 x₃+0.061 x₄, y₂=0.064 x₄+1.071 x₅-0.459 x₇, y₃=0.279 x₃+0.110 x₄+0.813 x₅-0.313 x₈, y₄=0.558 x₃+0.221 x₄+1.625 x₅-0.626 x₈. Ultra-sonic properties index, body weight and body size can be as direct or indirect indices of living meat production per-formance.