The　high-chromium　cast　iron　type　self-shielded　metal　cored　wire　(SSMCW)　for　hardfacing　with　good　operative　performance　and　appearance　was　developed.　The　hardness　of　deposited　metal　exceeds　HRC60,　and　the　wearing　resistance　is　21　times　higher　than　that　of　Q235　steel.　The　mechanism　of　self-shielding　was　researched.　When　manganese　content　arrives　at　5wt%　in　wire,　porosity　can　be　avoided,　while　TiFe　content　exceeds　10wt%,　pits　will　appear　in　the　weld　of　SSMCW.　The　microstructure　of　deposited　metal　consists　of　martensite　and　a　little　residual　austenite,　and　the　abrasive　resistant　hard　phase　M7C3　distributes　uniformly　in　martensite　matrix.