NOVELTY - An oxide fuel cell microstructure regulating method involves coating conductive silver paste on working electrode and reference electrode of fuel cell, and drying the fuel cell. The fuel cell is placed in a muffle furnace and three lead wires from electrodes are connected to corresponding terminal of electrochemical workstation. Polarization resistance value is determined from alternating current impedance spectroscopy. The anodic current is disconnected, and alternating current impedance spectroscopy is detected.    USE - Method for regulating oxide fuel cell microstructure.    ADVANTAGE - The method enables regulating oxide fuel cell microstructure with valid reaction area and decreased internal porosity of electrode, and overcoming problems of electrode preparation process, high temperature electrode sintering process, wastage of human resources and materials, unfavorable reaction electrodes, and increased labor, material resources and preparation cost.    DETAILED DESCRIPTION - An oxide fuel cell microstructure regulating method involves coating conductive silver paste on working electrode and reference electrode of fuel cell, and drying the fuel cell for 5-10 minutes. The fuel cell is placed in a muffle furnace at 80-200 degrees C and three lead wires from electrodes are connected to corresponding terminal of electrochemical workstation. The temperature of the furnace is increased to 400-1000 degrees C for 0.5-2.5 hours. Polarization resistance value is determined from alternating current impedance spectroscopy in muffle furnace at fuel cell by three electrode system. The constant anodic current is maintained at 400-100 degrees C for 5 minutes-20 hours in the electrochemical workstation through the fuel cell. The anodic current is disconnected, and alternating current impedance spectroscopy is detected by three electrode system to determine the polarization resistance value. The heating process of the furnace is stopped to make the polarization resistance value greater or less than 1.1X and 0.9X, and the furnace is cooled to room temperature to complete regulation of oxide fuel cell microstructure. The anodic current density of 100-1000 Acm-2 is applied at working electrode to detect reference signal when the impedance spectroscopy is detected. The impedance spectroscopy is detected with scanning frequency of 0.1 Hz-400 kHz. The signal strength ratio between the electrode alternating current disturbances is 10-20 mV.