This　work　aims　to　investigate　the　role　of　silica　support　in　the　catalytic　oxidation　of　rhodamine　B　(RhB)　over　LaFeO3-Silica　composites.　Four　LaFeO3-Silica　composites　using　mesoporous　silica　(SBA-15,　SBA-16,　MCF)　and　nano-sized　silica　powder　(NSP)　as　supports　are　prepared.　XRD,　N2　physisorption　isotherms　and　TEM　results　show　that　pure　LaFeO3　phase,　with　particle　size　of　15-20　nm,　is　prepared　and　the　texture　of　supports　remains　unchanged　after　the　deposition　of　LaFeO3.　Catalytic　results　show　that,　besides　the　function　to　disperse　LaFeO3　on　the　surface,　the　support　plays　two　important　roles　in　the　reaction:　one　is　to　absorb　RhB　from　solution　to　its　pores,　and　the　other　is　to　transport　RhB　from　the　pores　to　the　active　site,　both　influence　the　catalytic　efficiency.　Thus　the　non-porous　NSP　with　negligible　capacity　for　RhB　adsorption　is　the　worst,　and　the　porous　MCF　with　considerable　capacity　for　RhB　adsorption　and　the　strongest　ability　for　RhB　transportation　is　the　best　support　of　LaFeO3　for　RhB　oxidation.　SBA-15　and　SBA-16,　although　show　considerable　or　even　higher　capacity　for　RhB　adsorption　relative　to　MCF,　their　contribution　to　the　reaction　is　less　due　to　the　low　efficiency　of　transporting　RhB　from　the　pores　to　the　active　site.　On　these　bases,　the　role　of　silica　support　in　RhB　oxidation　conducted　over　LaFeO3-Silica　composite　is　proposed.　©　2015　Elsevier　Inc.