In this study,polyethylene (PE)wood-plastic composites were prepared with addition of calcium carbonate,talc powder and wollastonite as inorganic fillers.Particle size,morphologies and specific surface areas of these inorganic fillers were examined,and the effects of these fillers on various properties of the composites were investigated.The mechanical results indicated that bending strength of the composites with wollastonite achieved an optimum value while the composites containing talc powder obtained better impact toughness.Most of all,the mechanical properties,specific gravity,water absorption and hardness of the composites were improved gradually with addition of inorganic fillers up to 1 5 phr.However,when the inorganic fillers were excessive over 20 phr,the density and hardness of the composites still kept an increase,but their water absorption and linear thermal expansion coefficients tended to decrease.%通过在聚乙烯（PE）木塑复合材料中分别添加碳酸钙、滑石粉和硅灰石3种无机粉体材料，并采用扫描电子显微镜、万能力学性能实验机和热力学分析仪等对无机粉体的颗粒大小、微观形貌以及复合材料的力学性能等进行了测试。结果表明，硅灰石制备的PE木塑复合材料的弯曲性能最佳，滑石粉制备的PE木塑复合材料冲击性能较好；对于3种无机粉体而言，随着无机粉体添加量逐渐增加至15份（质量份，下同），PE木塑复合材料的力学性能逐渐提升，当无机粉体添加量增加至20份时，PE木塑复合材料的力学性能出现下降，密度和硬度逐渐增大，24 h吸水率和线性热膨胀系数逐渐降低。
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