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Recently, aramid nanofibers (ANF) have attracted much attention due to the excellent mechanical, insulating and high temperature resistance properties. However, the poor thermal conduction behaviors severely limit the application fields of ANF, especially under some harsh condition s. In this work, reduced graphene oxide (RGO) was used as an additive to improve the thermal conduction ability of ANF films, and the composition, structure, wettability, and thermal conductivity of the RGO/ ANF composite films were systematically characterized. The results show that the thermal conductivity of RGO/ ANF composite increases with the increased RGO content, and the 40 % RGO content can enhance the thermal conductivity of ANF by 540. 1 %. The high thermal conductivity of the as-prepared composites is due to the high thermal conduction ability of RGO. Besides, the contact angle of the composite film also increases with the increased RGO content. [ABSTRACT FROM AUTHOR]