A　single-bed　finned　tube　adsorption　refrigeration　system　model　was　established　to　compare　the　adsorption　characteristics　of　three　metal　organic　framework　materials,　MIL-101(Cr),　MIL-101(Cr)/CaCl2-10%,　MIL-101(Cr)/　CaCl2-20%.　The　change　of　material　properties　under　different　thickness/length/number　of　fins　was　characterized,　and　the　most　suitable　adsorption　bed　structure　for　different　materials　was　obtained.　The　results　show　that　the　number　of　fins　has　little　effect　on　the　COP　and　specific　cooling　power　of　the　material　in　the　system.　Choosing　thinner　fins　can　improve　the　COP　of　the　system.　With　the　increase　of　fin　height,　the　COP　showed　a　trend　of　increasing　first　and　then　decreasing.　The　three　materials,　MIL101(Cr),　MIL-101(Cr)/CaCl2-10%,　MIL-101(Cr)/CaCl2-20%,　obtained　the　highest　COP　when　the　fin　heights　were　50　mm,　60　mm,　and　70　mm,　respectively.　The　maximum　specific　cooling　power　was　obtained　when　the　fin　heights　were　20　mm,　60　mm,　and　70　mm,　which　were　21.7　W/kg,　90.1　W/kg,　and　174.5　W/kg,　respectively.　The　height　of　the　fin　has　a　great　influence　on　the　performance　of　the　system.　When　designing　the　adsorption　bed,　the　appropriate　fin　height　should　be　selected　for　the　specific　adsorbent.