Abstract: In 2016, a crossing between male Dorset sheep with female Cele black sheep was conducted in Cele Township, Cele County. In order to evaluate the heterosis of meat-producing performance of F1 sheep of Dorset sheep and Cele black sheep, 21 F1 male lambs in the same pen and 21 male Cele black lambs were randomly selected for heterosis analysis of the body size, weight, and slaughter performance at the age of from birth to 6 months. The results showed that under the same feeding and management conditions, the body height, body length, chest circumference and circumference of cannon bone of F1 lambs at 6 months old was significantly higher than the Cele black sheep（P＜0.01 or P＜0.05）; The body weight of the F1 lambs was significantly higher than the Cele black sheep at all stages of growth by age（P＜0.01）, and the average live weight, slaughter rate, and weight of various visceral organs were also significantly higher than the Cele black sheep（P＜0.01 or P＜0.05）. It could be concluded that the hybrids between Torset sheep and Cele black sheep could well adapt to the local environment and feeding management conditions and show the occurrence of heterosis, and the mode of hybridization can be extended.