Abstract: Poly(lactic acid) (PLA)/acetyl tributyl citrate (ATBC)/poly(ethylene glycol) (PEG) blend films were prepared by solution blending, and their structure and properties were characterized by Fouriertransform infrared spectroscopy, thermal analysis, X-ray powder diffraction, scanning electron microscopy (SEM) and tensile experiments. The results indicated that the tensile strength increased from 29.52 MPa to 33.40 MPa and the elongation at break increased from 262 % to 292 % after the PLA/ATBC blend films were modified with a proper amount of PEG. As a result, the flexibility of the films was enhanced. The terminal hydroxyl groups in PEG could interact with the carbonyl of PLA to form hydrogen bonds, which improved the thermal stability and crystallinity of blend films. SEM micrographs demonstrated that there was no crack on the surfaces of the PLA/ATBC/PEG blend films after aging for 90 days, suggesting that the service lifespan of films was extended. Moreover, the compatibility and processability of blend films were improved with the addition of small amounts of N,N′-ethylenebis(stearamide).