Development of onsite (in situ) soil treatment methods e.g. stabilization using soil amendments is gaining popularity as techniques less disruptive to the natural ecosystems and less expensive compared with conventional soil remediation methods. The study aimed at estimating the changes in the metal mobility resulting from the addition of the industrial rest products (coal fly ach, blast furnace slag) as amendments to the heavy metal contaminated soil. Soil samples contaminated with Cu, Cr, As, Pb were mixed either with 5% blast furnace slag (HS) + 4.6% peat or 5% coal fly ash (FA) + 4.6% peat. The chemical sequential extraction was applied to determine the redistribution of metal fractions in stabilized soil. The addition of the coal fly ash reduced the mobility of Pb by increasing pH of soil and by reducing the exchangeable fraction. Organic matter (peat) facilitated the stabilisation of Cu through the increase of the metal fraction bound to OM. Blast furnace slag was inefficient to increase the fraction bound to Fe-Mn oxides. On the contrary, the oxide fraction of Cu, Cr, and As decreased significantly after the addition of slag, probably due to the changes in redox conditions during the aging of the samples.