This　study　built　a　model　on　dynamic　link　travel　time　for　evacuation　route　in　an　emergency　of　Olympic　Games,　and　was　based　on　analysis　of　existing　models　of　link　travel　time　functions,　and　the　matching　analysis　between　the　conditions　of　fluid　mechanics　and　the　characteristic　of　evacuation　traffic　flow.　The　authors　proposes　the　Dynamic　Link　Travel　Time　Model,　by　which　travel　time　including　the　running　time　on　non-congestion　section　of　upstream　and　the　delay　time　of　downstream　intersection　can　be　estimated,　and　an　example　is　then　presented　to　test　the　accuracy　of　the　model.　This　study　is　a　base　for　dynamic　route　choice　in　an　emergency　of　Olympic　Games.