Roller　is　one　of　most　important　component　in　the　industry　of　steel　rolling.　Repairing　the　roller　by　using　overlaying　welding　can　not　only　decrease　the　cost,　enhance　the　life　of　roller,　but　also　can　save　the　consumption　of　roller　and　alloying　element.　A　flux　cored　wire　of　Cr　alloy　system　was　developed　for　repairing　cogging　roller,　joint　properties　were　studied　and　the　influence　of　alloy　element　on　the　wear　resistance　of　joint　was　analyzed.　The　result　shows　that　using　the　developed　flux　cored　wire,　the　Rockwell　hardness　of　weld　reached　HRC42~45　after　annealing　and　the　metallurgical　microstructure　was　martensite　and　residual　austensite.　When　the　developed　flux　cored　wire　was　used　with　sintered　flux　107,　the　formation　of　weld　was　excellent　and　slag　could　be　automatically　removed.　Other　conditions　equal,　the　weld　including　2%　wolframium　can　get　better　wear　resistance　than　the　weld　including　2%　molybdenum.