An　effective,　green　method　was　proposed　to　prepare　mesoporous　SiO(2)encapsulated　phosphotungstic　acid　(HPW)　catalysts　for　alkylation　desulfurization　of　3-methylthiophene　(3-MT).　3-aminopropyl　triethoxysilane　(APTES)　was　added　to　promote　the　formation　of　SiO(2)gel　and　immobilize　HPW　during　preparation.　Then,　SiO(2)encapsulated　HPW　catalysts　were　characterized　by　XRD,　N(2)physical　adsorption,　SEM,　TEM,　EDS,　Ultraviolet-Visible　spectrum,　FTIR,　NH3-TPD　to　study　the　physical　and　chemical　properties.　Characterization　results　show　that　the　initial　Keggin　structure　of　HPW　was　remained　during　the　preparation　and　there　exist　strong　interaction　between　HPW　and　SiO2.　Activity　of　catalysts　is　superior　to　that　of　reported　SBA-15　encapsulated　HPW　catalysts,　due　to　more　effective　encapsulation　of　HPW.　The　conversion　of　3-MT　could　reach　99%　with　HPW　content　of　30.8%　under　reaction　conditions　(reaction　temperature　of　363　K,　reaction　time　of　60　min　and　1%　catalyst　dosage).　Reducing　the　olefin　content　will　not　reduce　the　conversion　of　3-MT　but　could　effectively　reduce　the　self-polymerization　of　olefin,　which　is　also　beneficial　to　reusability　of　catalysts.　[GRAPHICS]　.