The disposable feeding and sectional feeding blend materials of the epoxy group of chain extender Joncryl ADR4368/poly(lactic acid)(PLA)/poly(butylene succinate)(PBS) were prepared by melt blending method, the crystallization behavior, thermal stability and rheological properties of the PLA/PBS chemical blends were studied by FT-IR spectrum, differential scanning calorimetry (DSC), thermogravimetric (TG), melt flow rate (MFR) and rheometer. FT-IR results show that the chain extension reaction happens between ADR and PLA/PBS; the DSC results show that the addition of ADR could improve the chemical blends of PLA/PBS, the cold crystallization temperature (Tc) to high temperature direction, and when the content of ADR is 1.0 phr, the disposable feeding Tc increases 11.93 ℃;and with increase of ADR, PLA/PBS chemical blends from β-crystal type to the more stable type of α-crystal, the disposable feeding can produce more stable α-crystal shape.The TG results show that after the chain extender ADR joining, PLA/PBS chemical blends have a tendency to improve the thermal stability of the sample, and compared with the PLA/PBS physical blending materials, the thermal decomposition temperature of the PLA/PBS chemical blends materials can be increased by 8.6 ℃. Dynamic strain scan results show that the "Payne effect" appear in energy storage modulus (G′) curves with the increase of strain (γ), when the ADR content is fixed, the shear strain critical (γ_c) of disposable feeding is higher than γ_c of the sectional feeding. Dynamic frequency scan results show that the ADR can increase entanglement of the molecular chain, when the ADR content is fixed, the blend materials of disposable feeding can produce more crosslinking/branched structure.