The LIAlO2 matrix was reinforced by a metal-wired mesh which had thickness in the range 0.27~0.35 mm. These composite matrixes were prepared by the tape casting and hot pressing processes. In the hot pressing process, the LiAlO2 green sheets fabricated by the tape casting method were pressed under 30 kgf/cm2 at 50 ºC for 30 minutes. Nitrogen cross-over of both LiAlO2 matrix and reinforced matrix was measured by applying pressure difference between the cathode and anode at the operating temperature of 650ºC in order to find out the stability of the matrixes due to crack formation. The single cell using the conventional matrix showed that when the pressure difference between the anode and cathode increased gradually, N2 cross-over percentage increased drastically. However, low percentage of the N2 cross-over was maintained in the single cell with the reinforced matrix regardless of the amount of pressures differences. The insertion of the metal-wired mesh to LiAlO2 matrix significantly improved the mechanical strength and stability of the matrix for MCFC.