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We have been developing a new fabrication method for electrolyte plate matrices for molten carbonate fuel cells, which we have named the paper-making method. The matrix is fabricated in a manner similar to that in which paper is made. This method is promising because it is suitable for mass production.We have investigated the performance of matrices made with the new method. The matrix porosity we obtained was within the preferable porosity range of about 60 to 70 X. In the porosity .range of 65 to 76 U. cross-over leakage was kept to a minimum and was little affected by the thermal cycle. At porosities of less than 60 K. cross-over leakage increased. These results agreed with those obtained in a free thermal-cycle test in which an electrolyte plate was placed i n a furnace and repeatly heated and cooled.A single 200 cm2 cell with an electrolyte plate with a porosity of about 68 W produced with the papermaking method has been subjected to more than 8200 hours of continuous operation. The degradation rate of the cell voltage was about 30uV/h. The main causes of this degradation were creepage of the electrolyte from the electrolyte plate and the reaction of the electrolyte with the reinforcing materials, such as alumina fiber.