Abstract: Cyclic voltammetry was used to measure the electrochemical property of electric double-layer capacitor made of carbon aerogel electrode in H₂SO₄ electrolyte. The results showed that carbon aerogel electrode had stable electrochemical property. Conducting thermoplastic was used as the serial resistance of two capacitors, and the resultant capacitors had higher working voltage and good voltage-keeping ability. The inner resistance of the two serial capacitors was 1.95Ω and the capacitance 17F.