The fiber content of textiles is one of the important factors affecting the quality of textiles.Its chemical composition detection technology has important application value in textile production and con-sumption.The application of the dissolution method and the color reaction method containing chlorine nitro-gen in the determination of the fiber content of textiles were discussed,in order to ensure the validity of the test results,the sampling methods of chemical components were analyzed in detail.On the basis of com-prehensive consideration of the sampling links and qualitative analysis of components,the fiber content in textiles could be accurately detected by using scientific detection methods.Scientific detection methods and rigorous sampling methods to ensure the accuracy and validity of textile fiber content detection was es-sential.The chemical detection techniques such as dissolution detection and color reaction with nitrogen chloride had significant application value in the detection of textile fiber content.