TOJJE desiccant dehumidifier use silica gel dehumidifying wheel with honeycomb structure, it's separated to processing area and reactivation area. The moisture of air will be absorbed by processing area of wheel, dry air bringed into room by the centrifugal fan. The absorbed wheel is moved into reactivation area by 8~18 rmh rotor, it will be dryed by heated reactive air. The room will be dehumidified by repeating working of dehumidifying wheel. The moisture content of room air can reach lowest 1g/kg amount to dew point temperature -40℃. It can be installed of cooling or heating system to control the room temperature.