Abstract: In order to study the influence of surface micro-geometry formed by different finishing methods on friction and wear, based on the analysis of experimental data, the fractal geometry theory and MATLAB software was used to construct a more accurate representation of reconstruction of the surface micro-geometry of flat grinding, grinding and electrochemical finishing processing method. On the basis of surface reconstruction, combining with surface micro-contact theory and Albert load curve, the surface wear stage and wear amount after grinding and electrochemical finishing were compared and analyzed.The analysis shows that compared with the "spike" like rough peaks formed by flat grinding and grinding, the shape of the rough peaks on the surface of the specimen after electrochemical finishing processing presents an "arc" shape with better friction characteristics, and the surface micro-geometric morphology has a higher degree of regularization, under the same peak-valley difference, the surface wear obtained by electrochemical finishing is more stable and the accuracy retention is better.