A Humidifying treatment was developed by sprinkling water on the particleboard mat surface before hot-pressing. Through analyzing the outer and core layer temperature change of the mat, the effect of humidifying treatment on mat heat conduction was determined. By comparing the temperature-time curves of core layers of boards made under different density and thickness, mat moisture content and hot-pressing temperature, the procedure of humidifying treatment for influencing the temperature of the mat core were educed.