Abstract: In this test ,32 female Kids of the Fuzz-Wooled Sheep in the Northeast China are divided into four groups at random one of which was used as the contrast group and fed with the basic daily food supplies and the remaining 3 groups were fed with 75,125,175 mg/kg Cysteamine in the daily food supplies respectively . The findings indicate that on average, the test group with 125 mg/kg Cysteamine produced the best result of enabling the kids to increase their weight by 20.96%（P≤0.01）every day and the wool length by 31.51%（P≤0.01）, decrease the ratio of the feed to the pork by 15.79%（P≤0.01） and increased the daily income by 66.07%（P≤0.01）.

Key words: cysteamine; lamb; daily weight increases; the wool length; the ratio of the feed to the pork; business returns