The surface free energies of inner layer and outside of wheat straw, pennisetum, veneer of poplar wood and Pokienia hod-ginsii were tested by SIGMA 701 instrument using four methods, which are critical surface tension method, geometric mean method, harmonic mean method and acid base method. The test results showed that the surface free energy of inner layer for wheat straw and pennisetum was higher than that of outside; the surface free energies of poplar wood and Pokienia hodginsii wood were higher than that of wheat straw and pennisetum; the surface free energy of poplar wood was higher than that of Fokienia hodginsii wood.%采用临界表面张力法、几何平均法、调和平均法和酸碱作用的试验方法,通过SIGMA 701 (KSV)仪器测量麦秸表层、麦秸内层、狼尾草表层、狼尾草内层、福建柏薄木和杨木的表面自由能.结果表明,麦秸、狼尾草内层表面自由能均比其表层高,福建柏薄木和杨木的表面自由能比狼尾草与麦秸高,且杨木的表面自由能高于福建柏薄木.
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