Objective To enhance the overall performance of casting polypropylene ( CPP) film, and improve the performance deficiencies of CPP film. Methods Blending polyolefin elastomer ( POE) and nano-SiO₂with polypropylene terpolymer as low-temperature heat-sealing layer, CPP film for modified atmosphere packaging( MAP) was prepared via three-layer co-extrusion casting technology. Results It showed that the properties of the films obtained met the requirements, their heat-sealing initial temperature was below 102 益 , their dart impact strength reached 289 g, and their tensile modulus was reduced by only 4. 44% , while the heat-sealing layer was composed of polypropylene terpolymer blended with 14 phr POE-A4085S, 4. 0 phr nano-SiO₂, and 1. 5 phr slip additives, the melting temperature was controlled between 240 ~ 250 益 and the chill roll temperature was 24 益 . Conclusion POE / nano-SiO₂system blended well with polypropylene terpolymer, and the resulting CPP film had good dart impact strength and tensile modulus.