Binder film thickness (BFT) plays a vital role during the design of asphalt mixture and fine aggregate matrix because BFT can exert a significant effect on the performance of asphalt materials. However, the surface area factors are affected by the different specific gravities of the aggregates, which are always ignored during the calculation of BFT. Moreover, whether the BFT is uniformly distributed in asphalt mixture is controversial. Hence, it is necessary to further study the distribution of asphalt film thickness in asphalt materials and its influence factor. This study analyzed the distribution of BFT in coarse and fine parts of recycled asphalt pavements (RAPs). Firstly, a part of four types of RAP (Teichert, Syar, Vulcan coarse, and Vulcan fine) were sieved by #8 sieve (2.36 mm) to achieve coarse and fine parts of RAP. Secondly, the binder content and aggregate gradation were investigated through the ignition and extraction method. Thirdly, surface area ratio was used to evaluate the influence of the ignition and extraction method on the surface area of aggregate sieved from RAP. Finally, the BFT of different types of RAP were calculated through two different methods to evaluate the effect of specific gravities of the aggregates on BFT. The results indicate that for the coefficient of variation, 30 out of 32 data were less than 15.0 %, which implies the BFT was almost evenly distributed in coarse and fine parts of RAP. In addition, the difference of surface area factors caused by the different specific gravities of the aggregates exerts negligible influence on the surface area and the calculation of BFT.