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.