Catalytic alkylation of toluene with methanol was studied at atmospheric pressure, 420℃, and toluene/methanol feed molar ratios of 2-6 in a fixed bed reactor. Catalysts were prepared from the commercial X-type zeolite by ion exchange with alkali cations and/or impergnation of NaN₃. The yield of xylenes decreased in the catalyst sequence NaX>Na-cluster X>KX; the reverse tendency was found for the yield of styrene and ethylbenzene. These results suggest that benzene ring alkylation and side-chain alkylation depend on the catalyst acidity and basicity, respectively. The distributions of the acidity and basicity were also investigated by differential scanning calorimetry(DSC) and correlated with the performance of the catalysts. It was thought that a surface acid property as well as a surface base property played an important role in the course of the reaction.