The GB/T 14766-2008 standard specifies the test methods and technical requirements for the determination of ISO Photosensitivity and ISO printing range of black and white continuous-tone photographic paper. The standard applies to the quality control and technical evaluation of continuous-tone photographic paper for black and white photography. The Photosensitivity and printing range of photographic paper are determined by specific exposure, handling and density determination methods, thus reflecting its performance in actual use. The implementation of the standard provides manufacturers and users with a unified measurement specification, which helps to improve product mass and suitability, and ensure the Stability and conformity of photographic paper in terms of image detail and luminance performance.