GB/T 2680-2021 "Determination of visible light transmittance, direct sunlight transmittance, total solar transmittance, ultraviolet transmittance and related window glass parameters" standard specifies a number of Measuring methods for architectural Glass in Optical inspection and thermal performance. Including the determination of parameters such as visible light transmittance, visible light reflection ratio, sunlight transmission and reflection ratio, ultraviolet transmittance ratio, etc. This standard is applicable to the testing of transparent materials such as single-layer Glass and multi-layer window glass, aiming to evaluate the performance of window glass in energy saving, Optical inspection comfort and UV protection. The standard describes in detail the operation steps and implementation requirements of each measurement method to ensure the accuracy and comparability of test results.