The montmorillonite,a form of layered silicate,was successfully intercalated into polylactide(PLA)matrix through solvent-casting technique.In addition,PLA/MMT nanocomposite films were produced,in which homogenous distribution of the silicate lamellae plays a key role in the mechanical properties of the films.A small amount(5wt%)of OMMT intercalated into the PLA ma-trix resulted in their flexibility enhancement,from 3.68%(pure PLA film)to 352.65%.The results of wide-angle X-ray diffraction(WAXD)patternsconfirmed that the silicate interlayer distance in-creased from 3.044 nm(for OMMT)to 3.56nm(for 5wt%,maximum)with increasing OMMT con-tents,but decreased to 3.319 nm when OMMT content was over 8wt%.FT-IR also verified the mo-lecular-level associations between PLA chains and OMMT lamellae by vibration variances of hydro-gen bonding.DSC thermograms demonstrated that thermal stabilities of the nanocomposite films en-hanced,due to the silicate lamellae dispersed into PLA matrix.