A　series　of　binary　RuO2-Ta2O5　oxide　composites　with　different　Ru/Ta　molar　ratios　were　deposited　on　titanium　substrate　by　a　thermal　decomposition　method.　The　structure,　voltametrical　characteristics　and　capacitive　properties　as　a　function　of　the　Ru/Ta　molar　ratios　were　investigated　by　X-ray　diffraction　(XRD),　cyclic　voltammetry　(CV)　and　galvanostatic　charge-discharge　tests.　The　results　show　that　the　degree　of　crystallization　of　the　Ti/RuO2-Ta2O5　electrodes　decreases　with　the　increase　of　Ta2O5　content　in　the　RuO2-Ta2O5　oxide　coatings.　A　completely　amorphous　structure　exists　as　the　proportion　of　Ta2O5　is　up　to　70　mol%　or　higher.　The　electrochemical　performance　of　the　Ti/RuO2-Ta2O5　electrodes　is　closely　related　with　the　composition　and　structure.　The　specific　capacitance　increases　firstly　and　then　decreases　with　the　ratio　of　Ta　to　Ru　in　oxide　coatings,　and　a　maximum　specific　capacitance　of　621.2　F.g(-1)(RuO2)　is　obtained　when　the　Ta2O5　content　is　70　mol%.