The changes in hydrothermal stabilities and adsorption properties of MCM-41 and KIT-1 mesoporous materials with titania loading were investigated. The MCM-41 mesoporous material was weak to hydrothermal treatment, but titania loading brought about the improvement of hydrothermal stability. The titania-loaded KIT-1 mesoporous material showed an excellent hydrothermal stability, so there were no remarkable differences in X-ray diffraction pattern and adsorption isotherm of nitrogen, even after hydrothermal treatment of 80℃ and 85% of relative humidity for 110h. The uptake of water was decreased considerably by titania loading, while that of cyclohexane was not altered. The partial loss of hydrophilic site for water adsorption on mesoporous materials gave rise to improve the hydrothermal stability.