Stainless　steel　powders　with　different　molybdenum　(Mo)　contents　were　deposited　on　the　substrate　surface　of　45　steel　using　a　6　kW　fiber　laser.　The　microstructure,　phase,　microhardness,　wear　properties,　and　corrosion　resistance　of　coatings　with　different　Mo　contents　were　studied　by　scanning　electron　microscopy　(SEM),　electron　probe　microanalyzer　(EPMA),　X-ray　diffraction　(XRD),　microhardness　tester,　wear　tester,　and　electrochemical　techniques.　The　results　show　that　good　metallurgical　bonding　was　achieved　between　the　stainless　steel　coating　and　the　substrate.　The　amount　of　M-7(C,　B)(3)　type　borocarbide　decreases　and　that　of　M2B　and　M-23(C,　B)(6)　type　borocarbides　increases　with　the　increase　of　Mo　content　in　the　coatings.　The　amount　of　martensite　decreases,　while　the　amount　of　ferrite　gradually　increases　with　the　increase　of　Mo　content.　When　the　Mo　content　is　M,　Mo2C　phase　appears　in　the　coating.　The　microstructure　of　the　coating　containing　Mo　is　finer　than　that　of　the　Mo-free　coating.　The　microhardness　decreases　and　the　wear　resistance　of　the　coating　gradually　improves　with　the　increase　of　Mo　content.　The　wear　resistance　of　the　6.0　wt.　%　Mo　coating　is　about　3.7　times　that　of　the　Mo-free　coating.　With　the　increase　of　Mo　content,　the　corrosion　resistance　of　the　coating　firstly　increases　and　then　decreases.　When　the　Mo　content　is　2.0　wt.　%,　the　coating　has　the　best　corrosion　resistance.