The　fiber　laser　spot　welding　process　is　studied　with　the　high-frequency　laser　focus　rotation　method　and　compared　with　the　traditional　laser　spot　welding　processes.　The　results　show　that,　under　the　thermal　conduction　welding　mode,　the　spot　weld　morphology　can　be　effectively　controlled　by　using　the　heat　accumulation　effect　from　the　laser　focus　high-frequency　repetitive　scanning　and　the　adjustment　of　the　laser　rotation　process　parameters.　With　the　further　heat　accumulation,　the　spot　weld　morphology　changes　from　the　double　＇V＇　shape　to　the　＇W＇　shape　and　until　to　the　＇U＇　shape.　Compared　with　those　for　the　traditional　laser　spot　welding　process,　the　width-depth　ratio　of　the　spot　welds　is　relatively　larger　for　the　high-frequency　focus　rotation　spot　welding　process　and　substantially　free　of　porosity　defects.　Simultaneously,　the　microstructure　and　microhardness　of　spot　welds　can　be　effectively　regulated　by　the　proposed　method.　©　2018,　Chinese　Lasers　Press.　All　right　reserved.