GB/T 39366-2020 is a special test standard for leather friction resistance colour fastness, which is applicable to all kinds of colored leather. The standard includes two test forms of dry friction and wet friction. The reciprocating friction method is used to drive the white cotton cloth to rub on the leather surface through the cylindrical friction head, and the colour fastness grade is assessed according to the degree of staining of the white cotton cloth. The test needs to use the friction resistance colour fastness test device (friction head diameter 16 +/- 0.1mm, pressure 9 +/- 0.2N), white cotton cloth in line with the standard, with GB/T 251 gray sample card and D65 Standard light source to ensure the test specification and provide a unified technical basis for mass control and performance evaluation of leather products.