Abstract: Two kinds of solid acid were prepared by using bentonite as carrier to adsorb concentrated sulfuric acid and concentrated phosphoric acid, which were characterized by IR, and the amount of acids adsorb by bentonite were determined by acidbase titration. The crossaldol condensation was carried out in the presence of the acidic bentonites and afford 5 corresponding α, βunsaturated ketones. The results showed that this method provides an effective way to afford this kind of compounds, with several advantages such as simple workup procedure, less amount of catalyst (0.4 g), high yield (73.5％～88.2％), shorter reaction time (60～150 min).