Changes in PAA 2000 macromolecules conformation in the bulk solution as well as on the surface of MnO₂ as a function of a kind of electrolyte (NaCl, CaCl₂), electrolyte ionic strength (I=0.01, 0.1) and pH (3, 6, 9) of the solution were measured. In order to determine the influence of electrolyte on PAA conformation in the bulk solution the expansion coefficient (α) was measured. Such quantities as: the square root of the mean of the square distance between ends of polymer chain ( sqrt(r²)), the square root of the mean of square radius of polymer coil rotation ( sqrt(s²)) and hydrodynamic radius of polymer coil in the bulk solution (Rh) were measured to describe changes in PAA macromolecule conformation during its coming from the bulk solution to the surface of MnO₂. Moreover, PAA adsorption layer thickness in the presence of two various electrolytes, NaCl and CaCl₂ (I=0.01, 0.1) was measured. From the obtained results it is clearly visible that researched factors: kind of electrolyte, its ionic strength and pH of a solution have great influence on the conformation of the polymer macromole- cules.