Abstract: A series of blended films with lignin as a filler blended with low-density polyethylene (LDPE) and ethylene vinyl acetate copolymer (EVA) respectively were prepared by extruding，pellet fabrication，and melt blow molding. The influence of lignin blending on morphology，mechanical properties，thermal analysis，differential scanning calorimetry and FT-IR were investigated for both polymer blends types. Thermal analysis showed that EVA/lignin composite was more thermally stable than LDPE/lignin composite. FTIR（fourier transform infrared）indicated the existence of intermolecular interaction between lignin and EVA. According to SEM（scanning electron microscopy）analysis very effective lignin dispersion and compatibility was achieved within EVA，which was better than within LDPE. When the content of lignin was less than about 30 wt%，the mechanical properties of LDPE/lignin and EVA/lignin were acceptable.