Through　the　investigation　and　analysis　of　status　and　influence　factors　in　post-earthquake　traffic　system,　this　paper　studied　the　influence　of　the　bridges,　roads　and　roadside　buildings　after　an　earthquake　on　the　optimal　path　searching.　This　paper　aimed　to　introduce　the　authors＇　study　of　route　choice　for　post-earthquake　transporting　exigency　based　on　the　principles　of　timely,　security　and　economy　of　the　transport　route　choice　under　exigency　situation.　To　describe　the　above　three　decision-making　parameters　in　accordance　with　mathematics　theory,　it　is　necessary　to　establish　the　objective　functions　through　processing　the　dimensionless　technique　and　weight　aggregation　so　as　to　set　up　a　mathematical　model　for　evaluating　the　utility　of　prepared　route　and　model　merges　collected　information　according　to　the　expectation　utility　attributes　as　well　as　to　make　the　multi-attribute　decision-making　problems　into　the　single　one.　In　order　to　find　a　scientific　post-earthquake　traffic　path　and　define　a　scheduling　decision-making　method　in　an　emergency　rescue　transporting　center　and　enhance　the　response　effect　of　the　emergency　rescue,　it　is　necessary　to　choose　and　establish　the　highest　expectation　utility　plan　and　to　develop　a　decision　information　system　which　has　the　ability　of　transportation　system　management,　optimal　path　analysis　and　searching　using　the　network-analysis　model　of　ArcGIS　Engine.