Poly (vinyl chloride) (PVC)/nano-hydrotalcite composites were obtained by processing PVC/nano- hydrotalcite composite resins prepared by suspension polymerization of vinyl chloride in the presence of hydrotulcite．The morphology and mechanical properties of PVC/nano-hydmtnlcite composites were investigated and compared with those of PVC/nano-hydmtalcite composites prepared by direct melt mixing of PVC and nano-hydrotalcite．It was shown that hydrotalcite particles were dispersed much more homogeneous in PVC composites prepared by the first method．In these composites hydmtaleite particles existed mainly as primary particles of nanoscales with no obvious aggregation．As a result

PVC composites prepared by the first method had better mechanical properties than those prepared by the second method．The tensile strength．Young’s modulus and Charpy impact strength of PVC composite increased with increasing the content of nano-hyarotalcite in a range of less than 5 wt％ The thermal stability of PVC composite resin increased as the weight fraction of nano-hydrotaleite increased．The storage modulus and the loss modulus of PVC/nano-hydrotalcite composites were all slighfly higher than those of the pristine PVC in the temperature region below and around the glass transition．tanδ and glass transition temperature of PVC/nano-hydmtaleite composites were almost as same as those of the pristine PVC.