In　this　work,　heat　treatments　were　performed　on　autogenously　laser　welding　of　laser　powder　bed　fusion　(LPBF)　AlSi10Mg　alloys　to　improve　mechanical　properties　of　welded　joints.　After　welding,　the　welded　joint　was　heat　treated　by　direct　aging　(DA)　and　solution　heat　treatment　and　artificial　aging　(T6)　treatment.　The　porosity,　microstructure　and　mechanical　performance　of　the　welded　joints　after　DA　and　T6　treatments　were　investigated　and　compared　with　the　as-welded　joint.　Results　show　that　the　microhardness　of　weld　metal　(WM)　has　been　increased　to　over　93.5　HV0.1　after　DA　treatment,　while　the　microhardness　in　the　T6　welded　joint　is　reduced　to　77.0　HV0.1,　from　82.0　HV0.1　in　the　as-welded　joint.　The　ultimate　tensile　strength　(UTS)　of　the　DA　treated　joint　reaches　276.5　MPa,　showing　an　increase　of　43.0%　compared　with　as-welded　joint.　The　DA　heat　treatment　of　the　LPBF　AlSi10Mg　welded　joints　effectively　improves　the　hardness　and　the　UTS,　which　can　be　mainly　attributable　to　the　reduction　of　the　hydrogen　pores,　the　enhancing　effect　of　solid　solution　strengthening　coming　from　the　Si　element　in　the　Al　matrix　and　the　dispersion　strengthening　of　Si　precipitation.