Abstract:Abstract：The purpose was exploring the difference of flavor and nutrition of Beijing-You chicken under different raising systems.By comparing and analyzing the muscle and egg flavor substances of Beijing-You chicken in different culture modes，the relationship between the quality and the breeding methods of Beijing-You chicken was studied.So as to provide reference for Beijing-You chicken breeding management and quality improvement.The results showed that the contents of inosine monphosphate（IMP）and L-Glutamic acid of Beijing-You chicken in free-range were higher than that in intensive feeding.There was no significant difference in IMP（P＞0.05），but in L-Glutamate，the difference was significant（P＜0.05）.The inosine showed the opposite and significant difference （P＜0.05）.There was no significant difference in egg nutrition（total amino acid and total fatty acid）between different breeding methods.The flavoury amino acids and polyunsaturated fatty acids of Beijing-You chicken in free-range were significantly higher than that in intensive feeding（P＜0.05），while the cholesterol was in opposite，but the difference was not significant（P＞0.05）.Lecithin and n-3 fatty acids showed there was no significant difference under different culture modes（P＞0.05）.The results showed that there were some differences in flavor and nutrients of Beijing-You chicken under different breeding methods，especially in flavor，flavor and unsaturated fatty acids.