A　cermet-supported　tubular　SOFC　was　fabricated　using　thermal　spray.　The　cell　performance　was　investigated　at　temperatures　from　750　to　900　degrees　C　and　pressures　from　0.1　to　0.5　MPa　to　examine　the　effect　of　operating　gas　pressure　on　the　cell　performance.　The　influence　of　gas　pressure　on　the　cathodic　polarization　was　studied　through　the　electrochemical　impedance　approach　to　examine　the　controlling　electrochemical　processes　during　cell　operation.　Results　show　that　increasing　the　operating　gas　pressure　improves　the　power　output　performance　significantly.　When　the　gas　pressure　is　increased　from　0.1　to　0.3　MPa,　the　maximum　power　density　is　increased　by　a　factor　of　32%　at　a　temperature　of　800　degrees　C.　The　cathode　polarization　decreases　significantly　with　the　increase　of　the　gas　pressure.　The　electrochemical　analysis　shows　that　the　main　control　processes　of　the　cathode　reaction　are　the　oxygen　species　transfer　at　the　three-phase　boundary　and　oxygen　diffusion　on　the　surface　or　in　the　bulk　of　the　cathode,　which　are　enhanced　with　increasing　gas　pressure.