An integrated performance analysis of solid oxide fuel cells (SOFC) in a non uniform flow field was investigated. The main feature of the analysis is the combination of the two dimensional flow. mass and energy balance equations together with micro-modeling based oil the electrochemical reactions, such its internal methane reforming. The model allows SOFC performance to be predicted more precisely than by assuming a uniform flow field, The calculated values agreed with the test results with discrepancies of less than 15% for ne current-voltage characteristic and less than 10% for the gas concentration. Results showed a remarkable difference in temperature and concentration profiles between the internal reforming condition and the hydrogen fuel condition. The most Suitable cathode gas supply techniques are also discussed.