Blend film was investigated. The influence of three and six months exposure to soil environment on selected characteristics of blend film was studied. Results indicated, that in two chosen experimental periods soil microorganisms, especially belonging to 6 fungal and bacterial genera: Aspergillus, Fusarium, Penicillium, Paecilomyces, Bacillus and Streptomyces, were able to lower, in comparison with control samples, tensile strength, elongation and weight loss values in all tested samples. Soaking and roasting did not increase biodegradation rate during both periods of soil burial.