Abstract: In order to further improve the interfacial adhesive properties of aramid fiber/rubber composites, based on the traditional "two-step" method was used to dip resorcinol-formaldehyde-latex (RFL), and aramid nanofibers (ANF) was added to the predipping solution and RFL dipping solution, respectively. The effects of addition process and content of ANF on the interfacial adhesion properties of aramid fiber/rubber composites were studied. The results show that when only 0.05wt% ANF is added to the predipping solution, the H pull-out force is 209.0 N, the peel force of single fiber is 19.8 N, and the dynamic fatigue life is 9829 times, which are 18.1%, 14.4% and 41.0% higher than those of the unreinforced system. Added 0.15wt% ANF to the RFL dipping solution, the H pull-out force is 206.5 N, the peel force of single fiber is 19.8 N, and the dynamic fatigue life is 8095 times, which are 15.9%, 16.1% and 16.1% higher than those of the unreinforced system. Adding ANF to the pretreatment system can effectively improve the dynamic adhesion properties, because the ANF has a good chemical effect with aramid fiber and isocyanate in the predipping solution, which is beneficial to the modulus transition at the interface and improves the stress transfer efficiency.