The　effect　of　B4C　content　on　microstructures,　hardness　and　wear　resistance　under　multi-stress　were　researched　respectively.　The　results　indicated　that　the　primary　carbides　grew　directionally　and　the　macrohardness　of　hardfacing　layer　was　increased　with　the　increment　of　B4C　content.　The　wear　resistance　of　hardfacing　alloys　presented　different　characteristics　under　different　stress.　When　a　few　primary　carbides　had　broken　off,　its　wear　resistance　was　better　than　those　of　hardfacing　alloys　which　lot　of　primary　carbides　broke　off.