The water sorption of polyacrylamide and guar based xerogels, with different guar concentration was researched. The change in chemical potentials of the solvent, of polymers ??1, ??2, and the Gibbs energy of mixing with water ?gm were calculated. It is found that guar has a higher sorption capacity for water, while polyacrylamide has lesser capacity. It is shown that the sorption capacity to water in PAA-guar xerogels decreases with increasing of guar in the xerogel. The swelling degree and surface area of PAA-guar xerogels was determined. The degree of swelling and surface area is independent on changes in the guar concentration in grid.