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Inclusion complex (ICs) ofb-cyclodextrin (bshowed that the feeding ratios ofb-CD and PLA and the molecular weight of PLA had signicant eects on the formation of theICs, and the formed ICs could be dispersed in water when the molecular number weight (Mn) of PLA was lower than 100,000, whereasthey agglomerated when the Mn of PLA reached 500,000 or more. The structures of the ICs were veried by Fourier transform infrared(FTIR) spectroscopy, dierential scanning calorimetry (DSC), and wide-angle X-ray diraction (WAXD). Results for surface contactmetric analysis (TGA) indicated that the ICs had a lower glass transition temperature than pure PLA had. The ICs of PLA andb-CDshow great potential as tissue engineering scaold.