Polypropylene (PP)/graphene nano-platelets (GNPs) composites were prepared via melt blending. The effects of different GNPs mass fractions on the fire retardancy and thermal conductivity of the composites were discussed. The results show that the oxygen index increase,while the horizontal burning rate decrease,but the smoke density fluctuates but increases overall with the increase of the filler content. As far as specific surface area of GNPs is concerned,the smaller has greater effect on slowing the horizontal burning rate. Samples with different thickness have great influence on the horizontal burning rate. With the increase of filler mass fraction,the specific heat capacity of the composites decrease slightly,and the thermal diffusion coefficient increase obviously. As for specific surface area of GNPs,the larger has more significant influence on the heat dissipation capacity of the sample.%采用熔融共混法制备了聚丙烯(PP)／石墨烯片(GNPs)纳米复合材料。讨论了添加不同质量分数的GNPs对PP／GNPs纳米复合材料的阻燃性能以及导热性能的影响。结果表明，随着GNPs用量的增加，PP／GNPs纳米复合材料的极限氧指数升高，水平燃烧速率下降，烟密度等级虽有波动但总体呈升高趋势；与比表面积大的GNPs相比，比表面积小的对减缓水平燃烧速率作用较好；不同厚度的试样对水平燃烧速率的影响差异很大；随着GNPs质量分数的增加，复合材料的比热容有所降低，热扩散系数明显增加；与比表面积小的GNPs相比，比表面积大的对复合材料散热能力影响更显著。
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