Abstract: The amino acid composition and fatty acid composition of muscle were studied in two pig breeds, that is, the native Dahe pig and the developed Dahewu pig, which is improved by cross-breeding between Duroc and Dahe pig. The Dahe pigs are famous for its excellent meat quality. The results indicated that the muscle of Dahe pigs and Dahewu pigs was rich in amino acid. The content of Glu was the highest, reaching 12.119 % and 12.320 % in Dahe pigs and Dahewu pigs, respectively. The content of Met and Pro was the lowest, respectively reaching 1.753 % and 2.535 % in Dahe pigs and respectively reaching 1.792 % and 2.566 % in Dahewu pigs. There were not significant differences in the amino acid composition between the two pig breeds （P〉0.05）.The Myf-6 gene influencing muscular differentiation was used a candidate gene to study the distribution of Myf-6 gene in the two pig breeds. And the relationship between Myf-6 gene and the amino acid composition of muscle was also analyzed. The results showed that there was not significant difference in the amino acid composition of muscle （P〉0.05）between AA homozygous individual and AB heterozygous individual.