GB/T 45520-2025 "Determination of 1-vinyl Imidazole and 2-methyl Imidazole in Spinning & weaving products" is a detection method standard formulated for two specific chemical substances in Spinning & weaving products in our country. The standard adopts High performance liquid chroma-tography, HPLC (HPLC) as the main detection technology, and specifies the whole process requirements such as sample pretreatment, instrument parameter setting and Data analysis in detail. It is suitable for chemical safety testing of various Spinning & weaving products such as clothing and home textiles, with special attention to the extraction efficiency and interference elimination methods of target compounds. The standard improves the detection method system of such substances in Spinning & weaving products in our country, provides a technical basis for product mass supervision and international trade, and will be officially implemented on November 1, 2025.