The　paper　focused　on　the　technological　research　on　model　manufacturing　using　selective　laser　melting　(SLM)　process,　materials　under　investigation　were　four　kinds　of　aluminum　alloys　powder　AlSi25,　AlSi10Mg,　AlMgSi0.5　and　AlMg3.　The　results　showed　that　different　aluminum　alloys　have　different　laser　process　thresholds.　When　laser　power　was　above　this　threshold,　aluminum　alloy　powder　melted　and　bonded　with　the　under　layer　and　fest　metallurgical　bonding　formed,　model　with　approx.　100%　density　can　be　achieved.　Further　research　showed　that　the　density　of　sample　from　all　the　four　kinds　of　aluminum　alloys　varied　with　laser　power　and　scanning　velocity,　at　the　same　time　they　showed　different　sensitivity　to　the　forming　of　holes　and　crack　because　of　their　different　metallurgical　properties.　Tensile　sample　from　AlSi10Mg　was　manufactured　with　optimized　parameters.　The　tensile　test　showed　that　the　sample　of　SLM　possessed　better　mechanical　properties　than　aged　casting　tensile　sample.　The　research　showed　that　SLM　would　be　one　of　the　effective　methods　of　direct　manufacturing　for　metallic　models　and　parts.