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Amino-ended hyperbranched polymer(HBP)was prepared by one-step synthesis method,taking cyanuric chloride and ethylenediamine as raw materials and acetone as solvent.PLA(polylactic acid)/PBAT(poly(butylene adipate-co-butylene terephthalate))blends with different ratios of HBP were prepared by mixing and then applying a melting and squashing method.The effects and mechanism of HBP on PLA/PBAT blends were studied bydynamic mechanical analysis(DMA),Thermogravimetric analyzer(TG),mechanical performancetests,scanning electron microscopy(SEM)and Fourier transform infraredspectroscopy(FT-IR).