This　paper　proposes　a　macroscopic　traffic　flow　model　for　urban　traffic　road　network.　First,　dynamic　digraph　is　used　to　model　the　urban　traffic　road　network＇s　topological　structure.　Then,　traffic　flow　data　which　is　based　on　an　extended　cell　transmission　model　and　the　traffic　shock　wave　theory　are　endowed　to　the　dynamic　digraph　to　construct　a　weighted　dynamic　digraph　model.　Finally,　the　modeling　method　is　applied　to　a　local　road　network　to　illustrate　the　availability　of　the　modeling　method　when　compared　with　real　data.