Аннотация:A proposed approach for quantitative analysis of samples by laser induced breakdown spectroscopy was used for composition determination of Al alloy samples. Disproportion between composition of laser plasma and bulk sample is explained by selective evaporation of components during melting - evaporation stage. Effect of Batanov - Bunkin - Prohorov - Fedororov transparent wave during laser ablation was accounted by proposed approach. Spectra correction method was Successfully used for analysis of Al alloys samples.