Abstract: In order to improve the characteristics of small size and large tail size of Gobi sheep, a crossbreeding experiment was conducted using Hulun Buir short tailed sheep as male parent by introductive crossing breeding method. The comparative analysis of early growth and development showed that although the early growth and development rules of F1 and F2 hybrid lambs were consistent with those of Gobi lambs from 0 to 3 months old, and the growth and development of F2 hybrid lambs were significantly faster than that of F1 hybrid lambs and Gobi lambs after 2 months old. The average daily gain from 0 to 3 months old of Gobi lambs, F1 hybrid lambs and F2 hybrid lambs was 121.189 g,138.978 g and 170.133 g, respectively, which indicated that hybrid F2 lambs grew fastest and Gobi lambs grew slowest. By comparing the body size and tail shape of 3 months old lambs, it was found that the height, body length and chest circumference of F2 hybrid lambs were significantly higher than those of Gobi lambs; the tail length and tail width of F2 hybrid lambs were 7.596 0 cm and 7.268 1 cm, respectively, which were significantly smaller than those of Gobi lambs. The obtained data suggested that the crossbreeding of Hulun Buir short tailed sheep could enlarge the body shape and decrease the tail shape of Gobi sheep effectively.