Selective laser melting (SLM) is distinguished for its characters that using of single component metal powder and complete melting of metal powder compared with selective laser sintering (SLS). So the metallic functional model and parts manufactured by SLM possess of fine microstructure and using properties similar to series production, and makes the direct manufacturing of metallic parts by single or small lot possible. The character of SLM and speciality of aluminium powder radiated by SLM process are briefly introduced. Balling phenomena during solidification of molten metal always take place when laser radiates aluminium powder by SLM, the methods such as optimizing of laser processing parameters and flowing of inert gas to overcome it are introduced. The powder of two aluminium alloys AlSi25 and AlSi10Mg are radiated with laser and the samples are made. The microstructure analysis showed that there is no pore and crack in the cross section, the thin microstructure can be divided into thin particle and overlapping zone, the microstructure in the overlapping zone obviously grew. The tensile test proved that the samples manufactured by SLM is distinguished for its excellent properties compared with the sample made from conventional methods. Functional model from aluminium alloys manufactured by SLM is proposed at last.