Polypropylene(PP)/poly(ethylene-octene) copolymer-grafted-maleic anhydride(POE-g-MAH)/bamboo fiber(BF) composites were prepared through blending PP and BF with POE-g-MAH by a twin screw extruder,and the morphologies, structures,cystallization parameters and mechanical properties of composites were analyzed by SEM,XRD,DSC and mechanical testing. The results demonstrate that the presence of POE-g-MAH in the PP/BF composites with 30%of BF mass fraction results in more crystal imperfection of the PP component, the significant improvement of impact strength for PP/BF composites,and the improvement of uniform dispersion of BF in the PP matrix. The addition of 2.5%of POE-g-MAH mass fraction can improve both strength and toughness of PP/BF composite,and the impact strength of PP/POE-g-MAH/BF(62.5/7.5/30)composites are better than that of pure polypropylene. The improvement of impact strength of the composites mainly results from energy-absorption process,better stress transfer and the increase in interfacial adhesion between PP and BF in the presence of POE-g-MAH.%将聚丙烯（PP）﹑竹纤维（BF）与马来酸酐接枝乙烯-辛烯共聚物（POE-g-MAH）共混，通过双螺杆挤出机制备PP/POE-g-MAH/BF复合材料，用扫描电子显微镜、X射线衍射仪和差示扫描量热仪观察和表征了其形貌、结构和结晶参数,测试了其力学性能。研究表明，加入POE-g-MAH，降低了BF质量分数为30%的PP/BF复合材料中PP晶相的完整程度，明显提高了复合材料的冲击强度，改善了PP基体中BF的分散均匀性。添加质量分数2.5%的POE-g-MAH，能进一步提高PP/BF复合材料的强度和韧性，PP/POE-g-MAH/BF（62.5/7.5/30）复合材料的冲击强度高于纯PP。冲击强度的提高主要源于POE-g-MAH所产生的能量耗散、改善应力的有效传递、增强BF和PP的界面粘附。
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