UV curing acrylic adhesives characterized by relatively high elastic modulus at room temperatureand high T_g can achieve significantly higher initial adhesive strength by changing the adherend’s surfacemorphology from a flat to sawtooth structure. However, with the sawtooth structure, the rateof deterioration accelerates over storage time causing the adhesive strength to decrease significantlyunder reliability test storage conditions of 60℃ 90％RH. In order to secure significantly higher adhesivestrength under reliability test storage conditions of 600℃ 90％RH, we verified the effect of surfacefree energy by studying the relationship between surface free energy of adherend and adhesivereliability. The results revealed that, the adhesive strength after reliability testing can be improvedthan or maintained equivalent to initial adhesive strength by the adherend conditions sawtooth structureand higher surface free energy. This is presumed to be because the reduction of residual stressin UV curing and the improvement in adhesive interface strength. Accordingly, to simultaneouslyachieve higher reliability and increased adhesive strength, it is essential to choose the sawtooth structurefor the adherend’s surface morphology and use adherend with a higher surface free energy.