Abstract: CaCO3 nanowhiskers and a liquid crystalline ionomer (LCI) were synthesized separated in lab, then the CaCO3 nanowhiskers and LCI were blended with PBT and PE to prepare the hybridized PBT/PE/LCI/CaCO3 nanowhiskers blends. The thermal behavior, morphology structure and mechanical properties of the blends were investigated by differential scanning calorimetry (DSC), FT-IR spectra, and tensile tester. The results showed that the crystallizing temperature and crystallinity of PBT are both increased by adding 3% LCI in the blends, and the LCI disperses homogeneously in the PBT matrix, thus verifying that LCI serves the function of compatibilizer. The mechanical properties of the hybridized blend come up to the maximum values if the contents of LCI and CaCO3 are 3% and 5%, respectively, thus verifying that LCI serves the functions of compatibilization and reinforcement simultaneously.