This　letter　reports　the　effect　of　CNT　doping　levels　on　the　pore　structure　of　carbon　nanotube　(CNT)/silica　xerogel　composites,　which　would　greatly　influence　the　composite＇s　physical　behaviors　and　their　applications　in　the　field　of　optics.　The　composites　were　prepared　by　sol-gel　technique　and　carried　out　pore　structure　analysis.　The　results　show　that　there　are　mainly　two　grades　of　pores,　centering　at　8　and　15　nm　respectively,　that　existed　in　the　structure.　The　relative　ratio　of　the　two-grade　pores,　also　BET　surface　area　and　pore　volume　of　the　composites,　change　with　the　different　CNT　doping　levels.　The　reason　may　be　that　the　addition　of　CNTs　can　act　as　inhomogeneous　crystalline　sources,　seduce　the　silica　xerogel　network　to　grow　around　them　and　therefore　change　the　gel　formation　process　of　silica　granules.　(c)　2006　Elsevier　B.V.　All　rights　reserved.