Abstract: The research focused on the effect of shear intensity on the crystallization process and the properties of the PA6/CaCl2 composites which were prepared through melting extrusion. With increasing shear intensity, the complex degree between PA6 and CaClz2 increased，the degree of crystallinity of PA6 decreased，the crystalline became more imperfect;the viscosity of PA6/CaCl2 melt increased.As the shear intensity increased，tensile strength and Izod impact strength of PA6/CaCl2 composites cxhibited a maximum, which could be related to the degree of both crystallinity and complex. When the shear intensity was below a certain critical value, the effect of degree of crystallinity was dominant，other wise, the effect of the complex reaction was dominant.

Key words: polyamidc 6, calcium chloride, shear intensity, structure, property