The change in the properties of low-density polyethylene after adding starch, oxo-material, polylactic acid, and their mixture was studied. Different amounts of the additives were added, and films were prepared by using a twin-screw extruder at 150-225 C. By Minitab software, the optimum percentages of the additives were selected. The films were kept under different environmentalconditions including "open atmosphere," "buried underground," and "buried underground with regular daily irrigation" for 6 months. The degradability, tensile strength, elongation at breaking point, and dart impact were measured. Thermogravimetric analysis and FTIR spectrum changes were used to monitor changes. SEM images illustrated that the starch changed the morphology significantly, while other additives did not show remarkable effects. Mechanical and chemical properties changed significantly when starch was added. The highest changes were recorded for the sample with three additives, which was showing the high efficiency of the film decomposition. The highest amount of chemical changes was recorded for the same film. After 6 months, the lowest crystallinity was recorded by DSC and XRD for the same sample. Different environmental conditions showed different effects on the films mechanical properties. However, chemical properties of the films, excluding the film with starch, did not change significantly.