EVA/nano-CaCO3 foam composites were prepared through molded foam method. The influence of diffe-rent contents of blowing agent AC，cross linking agent DCP and nano-CaCO3 on the foaming effect of EVA/nano-CaCO3 foam composites were studied. At the same time，the effect of different contents of nano-CaCO3 on the mechanical properties and foaming form were discussed. The results show that: when the contents of AC, DCP and nano-CaCO3 are 9%, 1%, 15% respectively, the comprehensive performances of the foam composites are optimal. The SEM indicates that: when the contents of nano-CaCO3 at 0~15%, can significantly improve the bubble hole size uniformity, reduce bubble hole size and increase bubble numbers; when filling quantity is higher than 15%, bubble hole is easy to appear slump and bubble hole becomes bigger.