[ $M"{o}ssbauer$ ] spectroscopy is one of the very powerful analytical methods for studying the steel properties. It is the most important advantage that the steel properties can be quantitatively analyzed by Mossbauer analysis. The quantitative analysis could provide various information about corrosion products, environmental condition, kind of steel, foreign element, particle size, etc. It can be also applied for the study of strength and phase of steel, as functions of the kind of steel and foreign elements.