Abstract: The powders of cathode material La_0.7Sr_0.3Co_1-xCu_xO_3-δ for intermediate temperature solid oxide fuel cell（IT-SOFC）were prepared with the solid reaction method.The crystal structure，high temperature conductivity and thermal expansion curve of these samples were characteristiced and a selected sample was tested in the single cell.The results show that the thermal expansion coefficients of （La，Sr）CoO₃ are decreased by Cu doping，while the conductivity at x= 0.05 is higher than that of the one without Cu.A single fuel cell with La_0.7Sr_0.3Co_0.95Cu _0.05O _3-δ as the cathode and Ce_0.8Sm_0.2O_1.9 as the electrolyte was tested，the maximum current density was 511mA/cm²，and the maximum power density was 0.106W/cm² at 850℃.

Key words: intermediate temperature solid oxide fuel cell, cathode material, La_0.7Sr_0.3Co_1-xCu_xO_3-δ