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The experimental research of mechanical properties and porosity of samples made of experimental high-strength magnesium-scandium aluminum alloy 1580 obtained through the method of multi-layer weld deposition including the application of deformation strengthening and also the further thermal treatment is carried out. There is investigated the impact of layer-by-layer deformation strengthening with the further thermal treatment upon mechanical properties and porosity of the samples of experimental high-strength aluminum alloy 1580 having magnesium-scandium during multi-layer weld deposition. There are shown the values of mechanical properties and porosity of samples subject to modes of deformation strengthening and thermal treatment. A possibility of the impact of deformation effect and thermal treatment upon porosity and mechanical properties of products made of aluminum alloys containing magnesium-scandium obtained during multi-layer SMT weld deposition is checked up. According to the results of the investigation there are drawn conclusions: it is determined that for porosity decrease in metal deposited there are required higher values of efforts of the deformation impact and a weld deposition mode selection excluding product over-heating influencing porosity of metal deposited; thermal treatment impact upon porosity of the metal deposited is not defined; the samples obtained with the use of deformation impact and long annealing with the duration more than six hours have higher mechanical properties.