Abstract: This study aimed to assess the effect of feeding pelletized straw diet on slaughter trait and meat quality of fattening lambs. A total of twenty four three-month-old mutton lambs were randomly assigned to one of four groups such that control group fed the diet of cut short corn straw ＋ alfalfa hay ＋ pelletized concentrate, group Ⅰ fed the diet of pelletized corn straw ＋ alfalfa hay ＋ pelletized concentrate, group Ⅱ fed the diet of pelletized mixture of corn straw and alfalfa ＋ pelletized concentrate, group Ⅲ fed the total mixed and pelletized diet of corn straw, alfalfa hay and concentrate. The feeding experiment lasted for fifty days. At the end of the experiment, the slaughter trait and meat quality of fattening lambs in different groups were determined and statistically compared. The results showed that there were no significant differences in carcass weight and dressing percentage between group Ⅰ and control group （P〉0.05）; group Ⅱ and groupⅢ had significantly higher carcass weight than that of control group （P〈 0.05）; group had significantly higher dressing percentage than group I and control group （P〈0.05）; the sequence of eye muscle area of different groups was as followed： group Ⅲ 〉 group Ⅱ 〉 group Ⅰ 〉 control group （P〉0.05）; compared to control group, the three experimental groups had lower water loss rate and shearing force （P〉0.05）; the pile4 h value of group II was significantly lower than that of control group （P〈0.05）, no significant differences in pH24h value between group Ⅱ and the other experimental groups were found （P〉0.05）. The combined data suggest that the pelletized corn straw diet, especially the total mixed and pelletized diet prepared with corn straw, alfalfa hay and concentrate, is appropriate for the short-term fattening of commercial mutton sheep.