In this paper, the working circulations and evaluation methods ofhigh-temperature heat pump dehumidification,were presented. On the basis ofresearch and development of RCG30G high-temperature heat pump dehumidifierfor wood drying(HTHPD),a series of practical drying tests were performed.The results are as following:1.RCG30G HTHPD can save energy effectivelywhile drying timber, and also has advantages of high drying speed, good dry-ing quality and lower drying cost.2.Using the refrigerent R142b can raise thesupply air temperature (Max.> 70℃) ’ shorten the drying cycle and reducethe energy consumption and the ozonospheric disturbance.3.By drawing se-cond return air from the low temperature area of kiln into HTHPD, the heatloss of kiln was reduced greatly, meanwhile the air volume need of the con-denser can be met perfectly.