This standard specifies a gas chromatograph-mass spectrometry detection method for the content of UV-320, UV-327, UV-328 and UV-350 UV absorbers in water-based paints and solar-based paints. This method is suitable for the determination of UV absorber content in these coatings. In the method summary, after the sample is leveled on a Glass sheet, purified by ultrasonic extraction and solid phase extraction column, it is determined by GC-MS and quantified by External standard method. Reagents and materials include methanol, n-hexane, acetonitrile and standard materials such as UV-320, UV-327, UV-328 and UV-350. The preparation process of mixed standard working solution includes the preparation of single standard stock solution and mixed standard stock solution.