In this paper, RuO2/TiO2 nanotubes composites were synthesized by loading various amounts of RuO2 on TiO2 nanotubes. The symmetric supercapacitors based on these nanocomposites were fabricated by using gel polymer PVA–H3PO4–H2O as electrolyte. The electrochemical capacitance performance of the nanocomposites in these supercapacitors was investigated by current–potential responses, galvanostatic charge–discharge tests and electrochemical impedance spectroscopy. The results show that the three dimensional nanotube network of TiO2 offers a solid support structure for active materials RuO2, allows the active material to be readily accessible (available) for electrochemical reactions, and improves the efficiency of the active materials. A maximum specific capacitance of 1263F/g was obtained for the RuO2 which was loading on TiO2 nanotubes.