The direct electrolytic reduction of SiO2 nanoparticles has been achieved in molten CaCl2 at 850℃ and in LiCl-KCl-CaCl2 at 500℃ or 600℃. A new type of SiO2 contacting electrode was prepared to fix SiO2 nanoparticles. Otherwise, we achieve silicon in nanoscale from silicon dioxide nanopartic- les. We not only observe the effect of size and shape between silicon dioxide particle and reducted silicon from TEM but also crystallization at different temperature from Raman spectra. Good crystalline at higher temperature and less crystalline at lower temperature. On the other way, we prepare Au@SiO2 particle and electrolytic reduction of Au@SiO2 to complex nanomaterial, Au@Si. And we control the shape of silicon dioxide by add Au nanoparticles or Au nanorod to approach silicon nanorod.