Abstract: Active carbon supported H ₃PW ₁₂ O ₄₀ (PW ₁₂ )solid acid catalysts are prepared and used in the etherification of light FCC gasoline with methanol.The effects of preparation conditions and the PW ₁₂ loading on the activities of PW ₁₂ (40)/C catalysts are studied.The results showed that the reflux time and the activating temperature influence the activity of the catalyst.As the loading of PW ₁₂ on active carbon is lower, the reaction of PW ₁₂ with the hydroxyl on the surface of active carbon makes the activity of the catalyst decrease.With the increase of loading of PW ₁₂ on active carbon, the activities of the catalysts increase.Using PW ₁₂ (40)/C as catalyst,under the conditions of reaction temperature 75℃,pressure 0.8MPa,molar ratio of methanol with tertiary carbonic olefins 1.0,and hourly space velocity 1.0 h ^-1 ,the ethers content in etherified light gasoline is up to 13.86%.