Abstract: In order to cultivate a new breed of specialized dairy sheep with independent intellectual property rights in China and improve the breeding efficiency of sheep, hybrid F1 generation of Dairy meade and small-tail Han sheep（hereinafter referred to as D-H F1） were selected as the research objects for the following measurement of production performance: 1) A total of 68 rams and 76 ewes of D-H F1 and small-tail Han sheep in good health were selected to determine the body weight and body size（body height, body length and chest circumference） at newborn, 3,6,12 and 24 months of age, and the average daily gain at 0-3, 4-6 and 7-12 months of age were calculated. The differences in body weight, body size and average daily gain between them were analyzed and compared. 2) Forty-five rams and 56 ewes from each of the three groups: D-H F1, small-tail Han sheep and Dairy meade sheep were selected to determine the tail morphological indexes（tail length, tail root circumference and middle circumference） at 6,12,24 months of age. The differences of them were analyzed and compared. 3) Six six-month-old D-H F1 and six small-tail Han sheep male lambs were selected and slaughtered, respectively. Slaughter performance indexes（pre-slaughter body weight, carcass weight, net meat weight, bone weight, tail weight, eye muscle area, slaughter rate, net meat rate and meat to bone ratio） were determined, and the differences of slaughter performance between the two breeds were analyzed and compared. 4) Statistical analysis was made on the reproductive performance of primiparous ewes（478 sheep） and multiparous ewes（201 sheep） of D-H F1 from 2018 to 2020. The milk production performance of 213 D-H F1 and 30 small-tail Han sheep after weaning lambs at three months of age were analyzed from February 2019 to February 2021.The results showed that: compared with small-tail Han sheep rams, the weight of D-H F1 sheep at birth, 3, 6, 12,24 months increased by 44.94%（P＜0.05）, 10.86%（P＜0.05）, 16.79%（P＜0.01）, 8.37%（P＜0.05）, 11.87%（P＜0.01）,respectively. Compared with small-tail Han sheep ewes, the weight of D-H F1 sheep at birth, 3, 6, 12,24 months increased by 40.81%（P＜0.05）, 20.49%（P＜0.01）, 10.20%（P＜0.05）, 17.40%（P＜0.01） and 9.25%（P＜0.05）, respectively. The average daily gain of D-H F1 rams and ewes was higher than that of small-tail Han sheep at the age of 0-3 months, 4-6 months and 7-12 months. The average daily gain of rams at the age of 4-6 months and ewes at the age of 0-3 months were significantly higher than that of small-tail Han sheep（P＜0.01）. The body height, body length and chest circumference of D-H F1 at the age of 6, 12,24 months were significantly higher than those of small-tail Han sheep（P＜0.05）. The tail length of D-H F1 rams and eves at the age of 6 and 12 month were significantly lower than that of Dairy meade sheep（P＜0.05）, but there was no significant difference between D-H F1 and small-tail Han sheep（P＞0.05）. There was no significant difference in tail length of 24 months age D-H F1 rams from Dairy meade and small-tail Han sheep（P＞0.05）. The tail length of D-H F1 ewes at the age of 24 month were significantly lower than that of Dairy Meade sheep（P＜0.05）, but there was no significant difference between D-H F1 and small-tail Han sheep（P＞0.05）. Tail root circumference and middle circumference of D-H F1 rams and ewes at the age of 6, 12 and 24 months were significantly higher than those of Dairy meade sheep（P＜0.01）, and significantly lower than those of small-tail Han sheep（P＜0.01）. The pre-slaughter live weight, carcass weight, net meat weight and bone weight of D-H F1 rams were significantly higher than those of small-tail Han sheep（P＜0.01）, and the tail weight was significantly lower than that of male small-tail Han sheep（P＜0.05）. The lambing rates of primiparous and multiparous ewes in D-H F1 generation were 166.1% and 227.9%, respectively. The survival rates were 95.5% and 98.7%, respectively. The average lactation period of D-H F1 generation was 151.4 days. The results indicated that the D-H F1 had excellent production performance and its comprehensive performance was outstanding. The D-H F1 generation showed heterosis in all aspects, and had great potential and market prospect to be bred as a new variety for both milk and meat.