A silicon-containing compatilizer (K-ADR) was synthesized from chain extender (ADR 4370s) and silane coupling agent (KH550) and applied in talc reinforced PTAT matrix composites. The structure of K-ADR was characterized by FTIR, 1HNMR and TGA, and the effects of solvent type. The PBAT/K-ADR/talc composite was prepared by melting blending with a torque rheometer, and the rheological properties, mechanical properties, microstructure of impact section and element distribution of the composite were characterized. The results showed that the best performance was obtained when the K-ADR contentwas6‰. The tensile strength, impact strength and bending modulus of this component are 19.11MPa, 67.68KJ/m2 and 378.36MPa. Compared with pure PBAT, the properties of the composites are improved by 5.3%, 110.7% and 346.7%, respectively. The water vapor transmittance coefficient (WVP) and oxygen transmittance coefficient (OP) of the composite films are 5.70*10-12g·cm/cm2·s and 3.17*10-13cm3·cm/(cm2·s·Pa), which are reduced to 2.1% and 1.0% of those of the pure PBAT samples, respectively.