The　effect　of　chromium　containing　0%,　0.49%,　1.02%,　2.1%,　3.2%　(in　wt.%)　on　the　morphology,　fracture　toughness　and　micro-hardness　property　of　Fe2B　in　high　boron　white　cast　iron　was　investigated.　The　results　indicated　that,　with　an　increase　of　chromium　addition,　the　morphology　of　Fe2B　becomes　larger　and　changes　from　the　block　to　rod　shape,　its　micro-hardness　increases　and　the　fracture　toughness　increases　first　and　then　decreases.　Compared　with　the　fracture　toughness　(3.8　MPa　m(1/2))　of　Fe2B　without　chromium　addition,　the　toughness　at　2.1　wt.%　chromium　addition　can　be　improved　by　above　one　time,　achieving　7.8　Mpa　m(1/2),　and　the　result　was　also　qualitatively　testified　by　the　micro-cracks　in　Fe2B　based　on　scanning　electron　microscope　micrographs.　(c)　2010　Elsevier　Ltd.　All　rights　reserved.