The composites of wasted tire powder/POE-g-MAH/PA6 were prepared based on PA6, wasted tire powder and POE-g-MAH by using twin screw extruder. The effect of elasticizer contents on mechanical properties, melting and crystallization behavior, crystal structure, thermal properties and microstructure of composites were studied. The results showed that the impact strength and elongation at break were significantly increased with increasing contents of the elasticizers, whereas it was contrary for the tensile strength and flexural strength. The DSC, XRD and TGA results showed that the PA6 matrix crystallization rate were increased, while crystallinity, crystal structure integrity and heat resistance were reduced with the addition of elasticizers.