GB/T 45518-2025 "Spinning & weaving products, determination of prohibited dyestuff, liquid chromatograph - high resolution Mass spectrometry" is a new detection standard formulated by our country for prohibited dyestuff in Spinning & weaving products. The standard innovatively adopts liquid chromatograph-high resolution mass spectrometry (LC-HRMS) technology to accurately determine various harmful dyestuff components such as dispersed dyes and acidic dyestuffs. The standard specifies the sample pretreatment, instrument parameter optimization and Data analysis processes in detail, especially solving the industry problems such as "incorrect detection and inaccurate detection" caused by dyestuff impurity interference. As an important technical basis for the safety testing of Spinning & Weaving products, the standard will be officially implemented on November 1, 2025.