EPDM-g-GMA was prepared by using a little styrene as the compatibilizer under the condition of DCP acting as the initiator. Then EPDM-g-GMA was blended with PET to increase the system's impact strength. The effects of EPDM-g-GMA content on the system's mechanical properties were discussed. The results showed that the system's impact strength improved markedly with EPDM-g-GMA content increasing, and it reached 344.9 J/m when EPDM-g-GMA content was 50%, which was about 12 times as high as that of pure PET. Wh...