Abstract:Taking the muscles of six parts of latissimus dorsi，triceps brachii，psoas major，longissimus dorsi，biceps gluteus femoris and semitendinosus of 18 fattening yaks as the research objects，the routine nutritional components，mineral elements and eating quality of the muscles in different parts of yaks were analyzed，and the differences between different quality of the muscles were studied.The results showed that there was no significant difference in protein（P>0.05），while the other indexes were significant difference，the fat content of latissimus dorsi was significantly higher than that of other parts （P<0.05）.From the perspective of mineral elements，the Ca and Na content of latissimus dorsi was higher than that of other parts，the K and Mg content of semitendinosus was higher，while the microelement of triceps brachii was higher.In terms of meat eating quality，the tenderness of psoas major and longissimus dorsi was better，and the water holding capacity of biceps gluteus femoris and longissimus dorsi was stronger than that of other parts.The results showed that there were great differences in the nutritional quality，processing and eating quality of different parts of muscles.And the quality of the longissimus dorsi was better，followed by the biceps gluteus femoris，which provided the basis for the future value-added technology of meat segmentation and the establishment of grading evaluation system.