The　goal　of　this　study　is　to　investigate　the　dynamic　mechanical　properties　of　low　yield　(LY)　point　steels　(LY100,　LY160,　and　LY225)　under　high　strain　rates　and　elevated　temperatures.　The　separate　Hopkinson　pressure　bar　system　was　used　to　conduct　dynamic　compression　tests　on　LY　steels　at　temperatures　ranging　from　25°C　to　800°C　and　strain　rates　ranging　from　1,000　s-1　to　5,000　s-1.　The　quasi-static　compression　tests　(0.001　s-1)　were　conducted　at　the　same　temperatures.　The　stress-strain　relationship　of　the　presented　three　materials　under　various　temperatures　and　strain　rates　was　acquired.　The　test　results　demonstrated　that　LY100,　LY160,　and　LY225　steels　have　an　obvious　temperature-softening　effect.　The　three　materials　show　low　strain　rate　sensitivity　under　the　strain　rate　is　not　more　than　3,000　s-1.　For　a　given　strain　rate,　the　flow　stresses　of　LY100　and　LY160　steel　are　consistent　at　400°C　and　600°C,　respectively,　and　both　materials　exhibit　dynamic　strain　aging.　Besides,　LY225　steel　exhibits　dynamic　strain　aging　when　the　temperature　is　above　400°C.　According　to　the　test　results,　a　modified　Johnson-Cook　model　of　the　LY　point　steels　was　established,　which　can　reflect　the　material　properties　well.　The　results　of　this　study　may　provide　a　basis　for　studying　LY　steels＇　dynamic　mechanical　properties.　　©　2023　American　Society　of　Civil　Engineers.