Abstract: Relationship between the catalytic activity and acid strength, and optimum condition for sythesis of terpineol catalyzed by MoO3/ZrO2 solid superacid were studied. Results showed that as the acid strength increased, the catalytic activity and selectivity of MoO3/ZrO2 also increased. MoO3/ZrO2(B) solid superacid was used to catalyze hydration of α-pinene at 80℃, mass part of catalyst 8%, reaction time 8 h, α-pinene: solvent:assistant:water 1:1:1:2 (mass part) to give α-pinene conversion at 85%, and selectivity of (α-terpineol) at 68.1%。