Blending poly(propylene carbonate) (PPC) with poly(adipate?butylene terephthalate) (PBAT) was involved in the preparation of PPC/PBAT composites. However, the limited compatibility between the two materials hinders the potential performance enhancement of PPC/PBAT composites. To improve the compatibility between PPC and PBAT, maleic anhydride (MA) as a polar monomer and 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane (DHBP) as an initiator were chosen for grafting onto PBAT to produce copolymer grafted Maleic anhydride (PBAT-g-MA).The interplay between PPC and PBAT-g-MA, as well as its impact on the properties of the blend, was thoroughly examined. The elongation at break of the blend was found to gradually increase with higher mass fraction of PBAT-g-MA. The elongation at break of PPC/PBAT-g-MA blends increased from 21.2% to 68.1%（60 and 40 are the quality scores of PPC and PBAT-g-MA, respectively）. Studies have shown that when the PBAT-g-MA content is lower than that of PPC, PBAT-g-MA functions as a uniformly dispersed phase within the PPC matrix. The anhydride group present in the material can effectively react with the end groups of PPC, thereby significantly enhancing compatibility between both phases and promoting stress transfer at interface layers to improve the mechanical properties of blends.