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The objective of this study was to investigate the surface free energy of poplar and yellow pine strands by Wilhelmy Plate Method.The measurement items included the surface contact angle,surface free energy and change of sample weight.Thirty industrial strands were randomly collected for each condition.The samples were cut down to 25.0-26.0 mm long.7.0-8.0 mm wide.The density and thickness of each sample were also tested.The range of density was from 0.35 to 0.75 g/cm3 and the range of thickness was from 0.5 to 1.0 mm.The research result shows that there is a close relationship between the wettability,mass change and moisture content.Both the density and the thickness of the strand have a small influence on the surface contact angle and the surface free energy.