The pyrolysis experiments on oil shale mixed with low-density polyethylene (LDPE) were carried out with the aid of thermogravimetric analyzer, differential scanning calorimetry system and distillation furnace. The results obtained indicate that a synergistic effect exists to some extent during pyrolysis of oil shale mixed with LDPE. The temperature of maximum degradation of the mixture is approximately 5℃ lower than that of oil shale. The difference in weight loss between the pure oil shale and that mixed with LDPE is 1.17% at 550℃. Co-pyrolysis experiments of oil shale mixed with LDPE show an increased shale oil yield, and the obtained oil containes novel alkynes or allenes.