To improve the physical properties of natural rubber(NR)-LLDPE blends, studies on the effect of gamma rays radiation on physical properties of NR-LLDPE blends have been done. The NR and LLDPE with different composition was blended using laboplastomill at 160 oC and 150kg/cm2 force for 5 minutes, and it was pressed to become a film using hot and cold press machine at 160 oC and room temperature respectively for 3 minutes by 150kg/cm2 force. LLDPE powder and granulate was used in the experiment. The film then irradiated by gamma rays at dose of 50, 100, 150, 200, and 300 kGy. Characterization of the film was carried out using tensile tester and SEM. The experimental result showed that gamma rays irradiation enhanced the tensile strength, hardness, and gel fraction of NR-LLDPE blends significantly. The maximum tensile strength was found at composition of NR-LLDPE blend containing 75 phr (part per hundred part of rubber) LLDPE and irradiated at 150kGy. The irradiated NR-LLDPE blends containing LLDPE powder give higher tensile strength compared to containing LLDPE granulate.