This　work　investigated　the　microstructure　and　mechanical　property　of　high-boron　multi-component　alloy　with　Fe,　B,　C,　Cr,　Mo,　Al,　Si,　V,　Mn　and　different　contents　of　Ti.　The　results　indicate　that　the　as-cast　metallurgical　microstructure　of　high-boron　multi-component　alloys　consist　of　ferrite,　pearlite　and　borocarbide.　In　an　un-modified　alloy,　continuous　reticular　structure　of　borocarbide　is　observed.　After　titanium　addition,　the　structure　of　borocarbide　changes　into　a　fine　and　isolated　morphology.　TiC　is　the　existence　form　of　titanium　in　the　alloy,　which　acts　as　the　heterogeneous　nuclei　for　eutectic　borocarbide.　Moreover,　impact　toughness　of　the　alloy　is　remarkably　improved　by　titanium　modification.