This work aims to develop the poly(lactic acid) (PLA) composites with fast crystallization rate and improved mechanical properties utilizing some unique properties of metal-organic frameworks (MOFs). The MOFs comprised of Zn-O-Zn dinuclear units and multidentate pyridine-2, 5-dicarboxylate linkers were synthesized. SEM and AFM were used to study the distribution of MOFs in PLA matrix and the results indicated MOFs dispersed well in PLA matrix. The significant impacts of MOFs on the crystallization of PLA were observed by DSC and POM. The tensile strength, storage modulus and T-g, were improved owing to the reinforcement of MOFs crystals in the PLA/MOFs composites. The tensile strength, storage modulus at 40 degrees C and T-g, of the PLA/MOFs composites with 1 wt% MOFs are increased to 56 MPa, 3425 MPa and 77.9 degrees C compared with 49 MPa, 1507 MPa and 66.2 degrees C for neat PLA, respectively.