TiO2　nanotube　arrays　(TNTA)　were　firstly　impregnated　with　ethanol　solution　containing　aniline　monomer,　then　the　polyaniline-TiO2　nanotube　arrays　(PANI-TNTA)　composite　electrode　was　prepared　through　polymerization　of　aniline　monomer　in　the　microcavity　of　the　nanotubes　using　ammonium　persulfate　(APS)　as　the　initiator.　The　effects　of　aniline　and　APS　concentration　on　the　properties　of　the　composite　electrodes　were　studied.　The　electrochemical　performances　of　the　composite　electrode　in　sodium　sulfate　aqueous　solution　and　sulfuric　acid　aqueous　solution　were　compared　at　different　potential　windows　of　-0.2-1　V　and　-0.2-1.8　V.　Results　show　that　the　composite　electrode　exhibits　optimal　performance　when　the　concentration　of　aniline　and　APS　is　0.2　M　and　0.05　M,　respectively.　The　composite　electrode　has　fair　good　electrochemical　performances　under　various　testing　conditions　especially　in　sulfuric　acid　aqueous　solution,　it　has　a　maximum　capacitance　of　816.7　F　g(-1),　and　at　the　enlarged　potential　window　of　-0.2-1.8　V,　its　energy　densities　are　higher　than　those　of　-0.2-1　V.　The　composite　electrode　also　has　excellent　rate　and　cycling　properties.