The　desiccant　rotor　is　widely　used　in　the　desiccant　cooling　system　or　fresh　air　unit　to　remove　moisture　from　the　air.　Generally,　the　regenerative　temperature　and　flow　rate　will　affect　the　dehumidifying　performance,　so　it　is　very　important　to　inspect　the　moisture　transportation　especially　when　the　desiccant　rotor　is　applied　in　the　solar　driven　system.　In　the　present　study,　three　kinds　of　silica　based　adsorbents,　including　the　modified　silica　gel,　mesoporous　silica　with　the　average　pore　size　of　2nm　and　4nm　respectively,　are　employed　to　construct　the　desiccant　rotors.　The　mass　diffusivities　of　these　materials　are　experimentally　measured　via　a　gravimetric　method　and　the　dehumidifying　capacity　using　silica　gel　is　experimentally　measured　via　a　conventional　method　by　recording　the　difference　of　the　humidity　ratio　between　the　inlet　and　outlet　air　ducts.　A　mathematical　model　is　set　up　and　verified　by　the　experimental　data.　Consequently,　the　effects　of　the　regenerative　temperature　and　rotary　speed,　and　the　structural　parameters　including　the　wall　thickness　of　desiccant　sheets,　sectional　area　ratio　between　the　adsorption　and　desorption　zones,　are　predicted　by　the　mathematical　model.