Ferronickel　slag　is　an　industrial　waste,　ranking　as　the　fourth　largest　smelting　slag　in　China,　with　an　annual　discharge　of　about　30　million　tons.　However,　only　8%　to　10%　of　this　slag　is　utilized,　leaving　a　substantial　amount　of　ferronickel　slag　unutilized.　This　not　only　pollutes　the　environment,　but　also　results　in　a　significant　waste　of　resources.　Recycling　ferronickel　slag　wastes　allows　for　the　optimum　use　of　resources,　which　benefits　initiatives　in　ferronickel　slag　powder　production　and　environmental　protection.　In　light　of　this,　ferronickel　slag　powder　(FSP)　and　mineral　powder　(MP)　are　mixed　here　to　achieve　the　optimal　proportion　when　incorporated　into　soil-cement　(the　mixture　is　simplified　as　FSMP)　for　application　in　subgrade　reinforcement.　In　the　subgrade　soil　of　airport　runways,　in　fact,　it　often　endures　the　impact　of　loads,　therefore,　to　study　the　influence　of　added　ferronickel　slag　powder　on　the　mechanical　behavior　of　soil-cement　after　impact　compression,　the　Split-Hopkinson　pressure　bar　(SHPB)　testing　was　conducted　on　a　series　of　soil-cement　samples　with　varying　FSMP　replacement　ratios　(0,　10%,　20%,　30%,　40%,　50%,　and　60%).　The　failure　mode,　compression　after　impact　(CAI)　strength,　and　dynamic　stress-strain　relationship　of　the　soil-cement　samples　were　studied.　The　results　indicate　that,　as　the　FSMP　replacement　ratio　increases　from　0　to　60%,　the　rate　of　peak　stress　growth　at　60-day　age　are　11.39%,　12.08%,　12.57%,　16.11%,　-16.83%,　and　-13.20%　respectively.　This　implies　that　the　dynamic　stress　first　increases　as　FSMP　increases　and　then　decreases　after　the　peak　is　reached　at　40%　FSMP　replacement.　Moreover,　as　the　curing　ages,　the　peak　dynamic　stress　gradually　increases.　The　rate　of　this　increase　is　significantly　higher　between　the　curing　age　of　7d　and　28d　than　between　28d　and　M60d.　The　addition　of　a　suitable　amount　of　ferronickel　slag　powder　can　enhance　the　impact　resistance　of　soil-cement.　These　findings　can　serve　as　a　foundation　for　understanding　the　application　of　soil-cement　in　engineering　under　impact.