Abstract: By the analysis of the tribological properties and the forming and stability of friction transfer films of PTFE composites modified by micro and nano metal particles respectively, the different forming and stability mechanisms of polymer friction transfer films are posted in the paper. The experiments and analysis indicate that filler particles have a great effect on improving anti-wear of composites, but also have a defect or shortage in improving the overall properties of PTFE composites purely modified by micro particles or nano particles.