The ISO TS 13473-4 standard specifies a method for light spectrum analysis of pavement texture by surface contour. This method uses surface contour data and uses spectrum analysis techniques to evaluate the spatial frequency characteristics of pavement texture. By analyzing texture features in different frequency ranges, it is possible to gain a deep understanding of the composition and structure of pavement texture. This method provides a scientific basis for quantitative characterization of pavement texture and is widely used in road engineering, traffic safety and pavement maintenance.