Evaluations　on　urban　traffic　condition　of　urban　street　network　forms　the　basis　of　macroscopic　characteristics　analysis　of　urban　transportation　system.　To　solve　the　problem　of　data　collection　while　quantifying　the　overall　performance　of　road　network,　this　paper　presents　a　method　of　data　collection　to　obtain　total　travel　time,　running　and　stop　time　per　unit　distance　of　vehicles　traveling　in　network　using　the　FCD　(Floating　Car　Data).　Map-matching　is　applied　to　calculate　the　travel　speed　of　vehicle　on　the　road　link.　A　critical　speed　is　employed　to　determine　the　vehicle　state　in　order　to　establish　the　macroscopic　evaluation　methodology　on　the　basis　of　two-fluid　model.　The　field　experiments　were　conducted　in　Beijing　CBD　area.　The　method　reflects　the　general　status　of　urban　traffic　condition　and　redounds　to　the　improvement　of　the　urban　traffic　management　and　the　development　of　travelers　information　system.