Abstract: The research progress in nanocomposites of poly(lactic acid) and inorganic nanofillers was reviewed in this paper, with technologies of insitu polymerization and insitu precipitation being emphasized．These insitu methods overcame the problem of aggregation of the nanoparticles．The inorganic nanofiller was finely dispersed in and strongly interacted with the polymer matrix so that improved the thermostability，glass transition，mechanical properties，optical performance of the composites．And it avoided thermal degradation by a fused．The application of the poly(lactic acid) based the composites was enlarged.

Key words: poly lactic acid, inorganic nanofiller, nanocomposite materials, in situ technology