Aiming　to　improve　the　performance　of　the　solar　adsorption　cooling　system　using　the　silica　gel-water　as　the　working　pair,　a　series　of　fin-enhanced　vacuum　tube　bed　have　been　developed　and　tested　experimentally.　The　characteristics　of　the　system　were　analyzed　as　the　fin　number　changed　between　zero　to　eight　in　the　bed.　It　is　revealed　that　longer　time　was　needed　for　the　preheating　and　desorption　of　the　bed　in　a　cycle　because　of　the　increase　of　the　heat　capacity　of　finned　tube　bed.　Nevertheless,　the　fast　heat　transfer　of　the　finned　tube　has　resulted　in　a　significant　reduction　of　the　pre-cooling　time　of　the　bed,　which　usually　took　the　biggest　part　in　the　whole　cycle　time　originally.　The　comprehensive　result　was　the　cycle　time　of　the　solar　adsorption　cooling　system　diminished,　and　the　general　performance　of　the　system　was　improved.　As　evaluated　under　the　criterion　of　the　specific　cooling　power　(SCP),　it　is　found　that　the　SCP2　of　the　finned　system,　which　is　defined　by　the　cycle　time,　increased　37.4%-80.7%　in　comparison　to　the　situation　of　the　smooth　tube　bed.　On　the　other　hand,　analyzing　the　coefficient　of　performance　(COP)　of　the　system　has　revealed　that　not　always　the　more　the　internal　fins,　the　better　the　performance　result.　The　experimental　results　told　us　that　the　COP　of　the　system　reached　the　optimum　as　the　fin　number　was　equal　to　four.　Over　enhanced　tube　bed　caused　the　performance　of　the　adsorption　cooling　system　to　deteriorate.