Subway　emergency　evacuation　is　a　crucial　technical　problem　for　disaster　mitigation.　It　can　be　done　effectively　if　people　in　the　disaster　area　can　make　use　emergency　evacuation　of　the　sign　system　in　time　when　disasters　suddenly　happen.　On　the　basis　of　the　investigation　of　the　medium　and　large　subway　stations　at　home　and　abroad,　this　paper　analyze　the　present　problems　of　emergency　evacuation　sign　system　of　the　domestic　subway　and　give　the　optimization　advices　by　comparing　with　the　overseas　system　in　terms　of　standardization,　correctness　and　influence　of　color,　etc.