Effects of microwave power density, radiation time and initial wood moisture content（MC） on resin removal from Pinus massoniana lumber were studied. The results showed that the resin removal rate increased by increasing the microwave power density and extending the radiation time. As initial wood MC increased, the resin removal rate increased in the beginning and then decreased. The optimal parameters were: microwave power density of 4 000 kW/m,3, microwave radiation time of 5 min and initial wood MC of about 80%. The resin removal rate of Pinus massoniana lumber reached 56.24% with no significant difference between inside and outside layer of the lumber samples.