According　to　the　influencing　factors　analysis　of　roads＇　emergency　earthquake　evacuating　in　key　area,　and　study　on　basic　ideas　and　principles　of　system　dynamics,　the　dynamic　feedback　of　earth-quake　evacuation　was　analyzed　from　three　aspects　that　disaster　environment,　road　space,　and　personnel　characteristics,　then　the　road　evacuation　causal　model　and　flow　model　based　on　system　dynamics　were　established.　Complied　with　the　standard　for　urban　planning　on　earthquake　resistance　and　hazardous　prevention　for　emergency　shelter,　evacuation　roads　and　evacuation　time,　dynamic　simulation　on　the　road　evacuation　capabilities　of　crowded　emergency　evacuation　area　during　the　earthquake　was　conducted,　related　recommendations　were　given　for　key　personnel-intensive　area　planning　from　the　simulation　results,　to　provide　a　reference　for　urban　earthquake　relief　work.　©,　2015,　Systems　Engineering　Society　of　China.　All　right　reserved.