Abstract: Selected 15 SAF1、DAF1 and SAF2、DAF2 which were ablactaed at 2.5 month old under the same condition to fat for sixty days, respectively. The result indicated that the average daily gain of SAF1、DAF1 was 269 grams and 262 grams, relatively increasing by 24.54% and 21.30% compared with ALT，respectively and the difference is remarkable（P<0.01）；The average daily gain of SAF2、DAF2 was 258grams and 254 grams, relatively increasing by 19.44% and 17.59% compared with ALT，respectively and the difference is better（P<0.05）；The differences of the average daily gain among SAF1、TAF1、SAF2、TAF2 are not better .During fattening period, the pure relatively increasing economic income of each hybrid lamb are 30.42 yuan、32.95 yuan、28.12 yuan、30.21 yuan. 

Key words: meat breed; altai sheep; hybrid male lamb; fattening test