In　this　paper　Fe-C-Ti-Cr　system　alloys　with　different　B　contents　were　prepared　on　Q235　steel　by　CO2　gas　shielded　flux　cored　arc　welding　method.　The　microstructure　of　the　Fe-C-Ti-Cr-B　alloys　were　analyzed　by　scanning　electron　microscopy(SEM).　The　abrasive　wear　resistance　performance　of　the　overlayer　was　evaluated　on　MLS-225　abrasion　testing　machine.　The　mechanism　of　wear　resistauce　was　studied　by　the　observation　of　attrited　surface　topography　with　SEM　and　energy　dispersive　spectrometer　(EDS).　The　results　are　presented　as　follows:　with　the　B　element　increasing,　TiC　particles　distributed　more　symmetrical　and　the　number　of　the　second　phase　and　hardness　of　the　alloy　also　increased.　When　the　B　content　increasesd　to　1.16%,　a　large　number　of　carbides　were　flake　away　from　the　wear　surface.　The　alloy　with　0.55%　B　content　exhibits　excellent　wear　resistance,　that　is　3.7　times　better　than　those　without　B.