Liquid Sb has been accepted for direct carbon solid oxide fuel cell anode material for its unique physical and chemical properties. Sb and Sb₂O₃ have a relatively low melting point of 630 and 636 °C respectively and the electrochemical formed Sb₂O₃ would drift away from the Sb/electrolyte interface because of density difference. So the density difference and viscosity of the liquid phases have influence on the two phase convection and the average thickness of insulator Sb₂O₃ layer. Sb_1-x-Ag_x (x = 0.1, 0.2, 0.3) alloy has a lower melting point and higher density than pure Sb. Since Ag₂O would not exist stably at temperature higher than 300 °C, Ag atoms in the Sb_1-xAg_x anode will not participate to the electrochemical reaction with O^2- at intermediate temperature. A tubular 8 mol.% Y₂O₃ stabilized ZrO₂ (YSZ) supported SOFC with La_0.6Sr_0.4Co_0.2Fe_0.8O₃-Gd_0.1Ce_0.9O_2-δ (LSCF-10GDC) as the cathode and Sb_1-x-Ag_x as anode was fabricated by slurry-casting, slurry-dipping and sintering processes. The primary I-V/I-P performance of the Sb_1-x-Ag_x abode cells was much lower than the Sb anode cell. Alloying Ag seemed to have a negative influence on the electrochemical reaction between Sb and O^2-, which might due to Ag atoms taking partial Sb atoms positions. Working at a current density from 0.1, 0.2, 0.3, 0.4 to 0.5 A cm^-2 at 750 °C, the final I-V/I-P performance of the alloy anodes cells was just a little lower than the Sb anode cell. The EDX analysis and SEM pictures of the tested cells revealed that elements re-distribution happened in the anode. The primary uniform distributed Sb_1-x-Ag_x alloy appeared to be a layered structure and the Ag content in the button layer was higher than that in the upper layer.