Poly(lactic acid)-graft-maleic anhydride (PLA-g-MAH) prepared by melt blending was used to compatiblize poly(lactic acid)/poly(butylene adipate-co-butylene terephthalate) (PLA/PBAT) blends. The structure and properties of PLA/PBAT/PLA-g-MAH composites were investigated by fourier transform infrared spectroscopy (FTIR), scanning elec-tron microscope (SEM), universal testing machine, pendulum impact tester, differential scanning calorimeter (DSC) and the hydrolysis of alkaline solution. SEM results showed that the phase interface became blurry between PLA and PBAT in PLA/PBAT blends with compatibilizer PLA-g-MAH, indicated that the PLA-g-MAH had certain compatibilized effect on PLA/PBAT blends. The incorporation of PLA-g-MAH resulted in a slight decrease of tensile strength and flexural strength compared with pure PLA, but improved impact strength and elongation at break about 17 times compared with pure PLA with added PLA-g-MAH. Moreover, the adding of PLA-g-MAH improved the biodegradability of PLA/PBAT blend.%通过熔融共混法制备马来酸酐接枝聚乳酸（PLA-g-MAH）用于改善聚乳酸/聚己二酸-对苯二甲酸丁二酯共混物（PLA/PBAT）的相容性，并对复合材料的形态结构、力学性能和生物降解性能进行研究。SEM结果显示，添加增容剂PLA-g-MAH后，PLA/PBAT共混物两相间的界面明显变得模糊，说明PLA-g-MAH对共混物有一定的增容作用；增容剂PLA-g-MAH的加入，使复合材料的拉伸强度和弯曲强度相比于纯PLA略有下降，但其冲击强度有一定程度的提高，断裂伸长率有显著提高，比纯PLA 的断裂伸长率提高了约17倍，表现出良好的力学性能；另外，PLA-g-MAH的加入提高了共混物的生物降解性能。
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