RuO2-TiO2　coating　were　prepared　by　thermal　decomposition　method　on　pure　titanium　TA2　substrate　at　270.　The　supercapacitor　behavior　of　RuO2-TiO2　coating　was　investigated　by　cyclic　voltammetry(CV),　electrochemical　impedance　spectroscopy　(EIS)　and　charging-discharging　test　in　0.5　mol/L　H2SO4,　0.5　mol/L　Na2SO4　and　1.0　mol/L　NaOH　electrolytes,　respectively.　The　results　show　that　the　Ti/RuO2-TiO2　electrode　has　low　charge　transfer　resistance　in　acidic　and　alkaline　electrolytes,　and　the　specific　capacitance　of　550　F/g　and　578　F/g　are　obtained　in　these　two　electrolytes,　respectively.　Conversely,　the　electrode　has　relative　higher　charge　transfer　resistance　and　lower　specific　capacitance　(335　F/g)　in　neutral　Na2SO4　electrolyte　than　that　of　in　acidic　and　alkaline　electrolytes.　However,　the　electrode　losing　17%　and　29%　of　the　maximum　capacity　after　2000　charging-discharging　cycles　in　acidic　and　alkaline　electrolytes,　respectively,　but　just　only　3%　lost　in　neutral　Na2SO4　solution.　Combined　with　the　SEM　and　EDS　analysis,　the　electrode　is　hardly　corroded　in　Na2SO4　solution,　thus　exhibits　good　cycle　stability.　In　contrast,　Ti/RuO2-TiO2　electrodes　occur　serious　surface　corrosion　in　NaOH　solution,　while　occurring　serious　pitting　corrosion　in　H2SO4　solution.　Severe　corrosion　results　in　a　significantly　reduction　of　active　substance,　and　thus　reduces　the　charge　capacity　of　the　electrode.　©　2016,　Science　Press.　All　right　reserved.