To　investigate　the　basic　characteristics　of　multi-component　boride　in　Fe-B　alloy,　the　samples　were　prepared　by　directional　solidification,　and　then　the　microstructural　evolution,　crystallography,　nanomechanical　properties　and　wear-resistance　of　multi-component　M2B　have　been　systematically　studied.　The　results　show　that　the　boride　grows　in　the　sequence　of　Mo-rich　-＞　Fe-rich　-＞　Cr-rich　M2B.　The　Mo-rich　M2B　has　the　body　centered　tetragonal　(bct)　structure　with　stoichiometry　of　Fe0.72Cr0.27Mo0.80(B,C),　the　Fe-rich　M2B　possesses　the　bct　structure　with　stoichiometry　of　Fe1.59Cr0.38Mo0.08(B,C),　while　the　Cr-rich　M2B　owns　the　body　centered　orthorhombic　(bco)　structure　with　stoichiometry　of　Fe1.48Cr0.50Mo0.02(B,C).　Moreover,　the　Mo　addition　can　facilitate　more　dislocations　in　the　M2B　compared　to　the　Cr　addition.　Thus,　the　Mo-rich　M2B　has　the　best　stiffness　and　toughness,　followed　by　the　Cr-rich　M2B　and　then　the　Fe-rich　M2B.　Additionally,　the　Mo-rich　and　Cr-rich　M2B　can　possess　higher　wear-resistance　relative　to　the　Fe-rich　M2B.