Poly 2-hydroxy propylmethacrylate-methyl methacrylate/SiO 2 (PHPMA-MMA/SiO 2), an active composite was used to synthesize polyamide-6/SiO 2 (PA6/SiO 2) organic–inorganic hybrid materials via blending method. X-ray diffraction analysis (XRD) results showed that the addition of PHPMA-MMA/SiO 2 composite induced PA6 to transit from α to γ crystal form. The nonisothermal crystallization kinetics of PA6 and PA6/SiO 2 hybrid materials was investigated by differential scanning calorimetry (DSC). Jeziorny method derived from Avrami analysis and a method developed by Liu were employed to describe the nonisothermal crystallization process of PA6 and PA6/SiO 2 hybrid materials. Based on our experimental data, if the relative degree of crystallinity was approximately 60% or more, the Jeziorny method was not valid to describe the nonisothermal crystallization process, while Liu method was successful to describe the whole nonisothermal crystallization process. When X( t) was below about 60%, the crystallization rates of PA6 and PA6/SiO 2 hybrid materials were very approximate, but when X( t) was approximately 60% or more, the crystallization rate of PA6 was quicker than that of PA6/SiO 2 hybrid materials. Moreover, the addition of PHPMA-MMA/SiO 2 composite decreased the crystallization activation energy Δ E calculated by Kissinger equation because of the γ transition.