Calibration-Free Laser Induced Breakdown Spectroscopy (CF-LIBS) has been developed several years ago as a new approach for quantitative analysis in spectroscopy. This technique attempts to provide accurate quantitative measurements regardless of calibrating the instruments or knowing much information about the sample. On the other hand, CF-LIBS is trying to solve the problems and limitations of other methods, such as using calibration curves, to discover better and more accurate results. In this study, after correction of the self-absorption effect, we tried to estimate the plasma temperature, precisely. Then by using CF-LIBS algorithm, we determined the concentration of elements such as Al, Mg and Mn, which are the major components of aluminum-based alloys.