The effect of an anionic polymer-polyacrylic acid (PAA) adsorption on the alumina (Al2O3) suspension stability was studied. The influence of the following parameters was examined: polymer molecular weight, its concentration and solution pH. Two methods were used to monitoring the suspension stability: turbidimetry and spectrophotometry. The conformational changes of macromolecules, both adsorbed and non-adsorbed, determine the stabilization-flocculation properties of the alumina suspension in the presence of the polymer.