Tunable　carbon　nanotubles　(CNTs)-coated　monoliths　as　catalyst　supports　were　prepared　by　catalytic　chemical　vapor　deposition　(CCVD)　over　deposited　cobalt　on　cordierite.　The　influence　of　the　preparation　conditions　such　as　the　cobalt　nitrate　loading　on　the　cordierite　monoliths,　the　flow　rate　of　reaction　gases,　reaction　time　and　temperature　on　CNTs　yield,　thermal　properties　and　structural　features　of　the　resulting　materials　were　studied.　The　CNTs-cordierite　was　characterized　by　TEM/HREM,　SEM,　N-2　physisorption　and　TGA.　The　SEM　showed　that　a　relatively　homogeneous　mesoporous　layer　of　CNTs　covered　on　the　surface　of　the　cordierite　monoliths.　Comparing　with　the　bare　cordierite,　the　BET　surface　area　and　pore　volume　of　CNTs-cordierite　increased　significantly.　CNTs　have　penetrated　into　the　cordierite　substrate　and　led　to　a　remarkable　mechanical　stability　of　the　CNTs-cordierite　monoliths　against　ultrasound　maltreatment.　The　CNTs　content,　BET　surface　area,　pore　volume　and　thermal　properties　of　CNT-scordierite　monoliths　all　could　be　changed　by　the　variation　of　the　synthesis　conditions.　Barium　promoted　ruthenium　catalysts　supported　on　the　as-synthesized　materials　showed　much　higher　activity　for　ammonia　synthesis　than　their　counterparts　deposited　on　bare　cordierite　monoliths.　Furthermore,　the　catalytic　activity　linearly　increased　with　the　BET　surface　area　of　CNTs-cordierite　monoliths.　The　CNT-scordierite　monoliths　were　proved　to　be　promising　candidates　as　catalyst　supports　and　the　performance　of　catalysts　supported　on　as-prepared　materials　would　be　easily　modified　by　changing　the　growth　conditions　of　CNTs.