Abstract: Addition reaction between α-pinene and methanol under microwave irradiation was studied, and the optimum experiment factors are as follows: α-pinene 0.03 mol, methanol 0.12 mol, sulfuric acid (catalyst) (1.34 mmol,) microwave power 70 W and reaction time 100 min. The yield of the main product methyl α-terpinyl ether in the reaction mixture reaches 42.5% under the optimum experiment conditions. The reactions under microwave irradiation not only have reaction rate 4 times higher than that by conventional heating method, but also have better productivity and selectivity. The application of microwave technique in the synthesis of methyl α-terpinyl ether has the advantages of high yield and short time, with the potential of extensive utilization.