Fe-based　powder　was　manufactured　on　42CrMoA　steel　substrate　using　non-contact　ultrasonic　vibration-assisted(UVA)　laser　metal　deposition(LMD)　process　with　different　exciting　distances(d),　and　the　temperature　field　and　stress　field　distribution,　microstructure　and　mechanical　properties　of　the　deposited　layers　were　investigated.　The　results　show　that　the　distribution　of　temperature　field　was　more　uniform,　especially　at　the　bottom　of　the　molten　pool,　and　the　gradient　of　temperature　field　decreased.　Compared　with　the　condition　without　UVA,　the　residual　stress　peak　value　of　the　tensile　stress　area　decreased　significantly　after　UVA　applied.　When　d=80　mm,　the　peak　tensile　stress　and　compressive　stress　were　90.5　MPa　and　72.6　MPa,　respectively,　which　were　reduced　by　45.6　%　and　25.2　%　compared　with　the　condition　without　UVA.　The　length　of　the　columnar　crystals　and　the　region　of　the　columnar　crystals　decreased　at　the　interface　after　UVA　applied.　The　application　of　UVA　can　significantly　improved　the　microhardness　of　deposition　layer.　With　the　reduction　of　the　residual　stress　at　the　interface　and　the　improvement　of　uniformity,　the　tensile　properties　of　the　deposit　were　also　significantly　improved.　The　highest　tensile　strength　was　1281.3　MPa　when　d=80　mm,　which　was　30.12　%　higher　than　that　without　UVA.　©　2024　Elsevier　Ltd