Beijing　CBD,　guided　by　modern　service　industry,　is　international　business　areas　with　international　finance　as　the　leading　role.　By　fitness　function　model,　it　researches　the　scale-free　characteristics　of　industrial　network　of　CBD　Ribbon,　on　the　basis　of　analyzing　its　network　node　by　cluster　analysis.　The　results　show　that　the　modern　service　industry　is　closely　linked　to　the　traditional　leading　industries,　and　the　stimulative　correlation　relationship　with　the　rest　of　the　industry,　which　will　promote　the　continuous　optimization　of　regional　industrial　structure.　©　2013　Springer-Verlag　Berlin　Heidelberg.