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In this paper, epoxy resin based composites filled with nano-silica were fabricated. The relationships between the dielectric properties as well as glass transition temperature (Tg) and nano-filler content were investigated. The results showed that, relative permittivity (Â¿r) and dielectric loss tangent (tanÂ¿) decreased when filler content was no more than 0.3 wt.%, and reached minimum value at 0.3 wt.%, but above this filler loading, Â¿r and tanÂ¿ started to increase with increasing filler content. The DC volume resistivity decreased with the introduction of nano-silica, and the value of Tg did not appear to change significantly with filler content.