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A cone-shaped gadolinium doped ceria (Ce0.9Gd0.1O1.95,GDC) electrolyte cylinder with a thin wall was fabricated using slip casting technique.The diameter of the larger open end of the cone-shaped cylinder was 0.85 cm,the length was 1.0 cm,and the thickness of the wall was 0.026 cm after sintering.Both the electrolyte and electrode powders were fabricated by using a glycine-nitrate process.A single solid oxide fuel cell (SOFC) was prepared with the cone-shaped electrolyte,NiO-GDC (70:30 wt.％) anode and Sm0.5Sr0.5CoO3 (SSC) cathode.Its electrochemical performance (Ⅰ- Ⅴcurve) and electrochemical impedance spectroscopy (EIS) were studied with humidified hydrogen as the fuel and air as the oxidant.The maximum output power density was about 300 mW/cm2 at 700 ℃.The EIS results showed that the dominant loss of the SOFC was from the ohmic resistance of the electrolyte.