Abstract: To evaluate the hybrid effect of Grassland Short-tailed sheep with slow growth and low reproductive modified by Australian white sheep×Hu sheep（hereinafter referred to as Ao-hu sheep） ram, body weight, eye muscle area and back fat thickness of 4 month-old healthy female lambs from Ao-hu × Grassland Short-tailed sheep（ternary hybrid sheep, n=417）,purebred Grassland Short-tailed sheep（ternary hybrid sheep female parent, n=219）,Ao-hu sheep（ternary hybrid male sheep, n=10）,purebred Australian white sheep（Ao-hu sheep binary hybrid male sheep, n=25）, and Hu sheep（Ao-hu sheep binary hybrid female sheep, n=100） were measured, and the lambing rates of the four experimental sheep groups（Ao-hu × Grassland Short-tailed sheepn=87,purebred Grassland Short-tailed sheepn=209, Ao-hu sheepn=20, Hu sheepn=126） were calculated from farm production records and the differences in these indicators between the five experimental sheep groups were analysed.The results showed that the body weight and eye muscle area of Australian white sheep at 4 months of age were 42.10 kg and 12.14 cm~2, respectively, which were significantly higher than those of other four breeds（P＜0.05）; the backfat thickness was also significantly higher than those of the other four breeds（P＜0.05）; the variation of body weight and backfat thickness of Australian white sheep was larger than that of the other four groups.The body weight and eye muscle area of 4-month-old Hu sheep were significantly higher than those of Grassland Short-tailed sheep and Ao-hu × Grassland Short-tailed sheep（P＜0.05）. Compared with Hu sheep, the body weight and eye muscle area of 4-month-old Ao-hu sheep increased significantly, especially the eye muscle area reached 11.06 cm~2, which was significantly higher than that of its Hu sheep female parent（P＜0.05）; backfat thickness of Ao-Hu × Grassland Short-tailed sheep was also significantly higher increased（P＜0.05）, and the variation amplitude also increased correspondingly in the hybrid offspring population. Compared with Ao-hu sheep, the body weight and eye muscle area of Ao-hu × Grassland Short-tailed sheep were significantly decreased（P＜0.05）; compared with Grassland Short-tail sheep, backfat thickness of Ao-hu × Grassland Short-tailed sheep was significantly decreased by 25.5%（P＜0.05）, body weight and eye muscle area were slightly increased, but did not reach a significant level（P＞0.05）.The lambing rate of Hu sheep was the highest, reaching 217%, which was much higher than that of Ao-hu sheep, Ao-hu × Grassland Short-tailed sheep, and Grassland Short-tailed sheep.The lambing rate of Ao-hu × Grassland Short-tailed sheep was 121%, which was 15.2% higher than that of Grassland Short-tailed sheep（105%）.The results indicated that the lambing rate of the hybrid system（Ao-hu × Grassland Short-tailed sheep） was slightly improved. However, the meat production performance was not significantly improved. More varieties should be carried out to determine the combining ability, so as to select and determine the best cross combination and establish an efficient cross-breeding system for mutton sheep production.