At　present,　most　navigation　software　has　the　display　function　of　real-time　road　conditions.　However,　the　congestion　status　of　the　same　road　sections　displayed　by　different　navigation　software　is　not　necessarily　the　same.　Because　it　is　different　for　different　software　platforms　to　collect　data,　evaluate　methods　and　standards　of　congestion　status.　Nowadays,　navigation　software　usually　uses　taxi　GPS　to　collect　data　points　and　calculate　the　average　speed　to　find　out　the　road　congestion　status.　Based　on　this,　this　paper　proposes　a　new　method　to　measure　the　congestion　status　of　road　sections.　Based　on　the　taxi　GPS　trajectory　data,　we　extract　the　vector　characteristics　of　taxi　trajectory　data　and　obtain　the　number　of　taxi　state　vectors　on　the　road　segment　to　measure　the　congestion　status　of　road　sections.　This　method　is　more　accurate　than　the　current　method　of　determining　road　conditions,　and　the　method　is　more　time-sensitive.　©　2018　IEEE.