Dynamic　mechanical　behavior　of　S30408　structural　stainless　steel　was　studied　at　different　elevated　temperatures　and　strain　rates　by　using　split　Hopkinson　pressure　bar　(SHPB)　installed　with　heating　and　synchro　assembly　system.The　quasi-static　experiment　(0.001　s-1)　was　operated　in　the　DNS100　material　test　system　at　different　temperatures.Experimental　results　show　that　the　material　has　obvious　strain　rate　strengthening　effect　and　temperature　softening　effect,　and　at　a　certain　temperature,　temperature　becomes　the　main　factor　affecting　material　performance.Based　on　the　characteristics　of　flow　stress　curve　of　S30408,　the　Johnson-Cook　model　was　modified.The　modified　Johnson-Cook　model　is　in　good　agreement　with　the　experimental　results,　and　the　constitute　model　of　S30408　structural　stainless　steel　can　be　used　for　structure　analysis　at　high　temperature　and　strain　rates.　©　2019,　Editorial　Board　of　Journal　of　Huazhong　University　of　Science　and　Technology.　All　right　reserved.