Abstract:The percentage of muscle fibers type and meat quality indexes were measured on biceps femoris of Ujumqin sheeps slaughtered at 1，3，6，9，12，18 months of age.Based on these measurements，the correlation between muscle fibers type and meat quality.Results showed that with the increase of months，the percentage of type I had displayed a significantly decreasing tendency with increasing age （P＜0.05），the percentage of typeⅡa had the increasing tendency 1-9 month-aged，the percentage of type Ⅱb had had displayed a significantly in1month～18month-aged.Thepercentageofmusclefibers types had a significant negative correlation with y*value（P＜0.05）and a negative correlation with L*value，r*value，shearing force and cooked meat yield（P＞ 0.05）.