It　is　very　important　to　provide　guidance　information　timely　and　correctly　in　order　to　decrease　traffic　jam.　This　paper　proposes　the　concept　of　time　ahead　of　guidance　first,　the　queuing　theory　model　was　used　to　forecast　short-term　travel　time,　and　the　guidance　model　was　eastablished,　which　based　on　the　traffic　congestion　prediction　model.　The　Sitong　Bridge　to　Zhongguancun　First　Bridge　section　was　used　as　a　concrete　example　to　check　the　forecast　model　and　the　guidance　model.　©　2011　IEEE.