Abstract:To establish gas chromatography fingerprint of Fenggang zinc-selenium tea during different processing, and combined with chemical pattern recognition method to explore the differences of volatile components during different processing, and to evaluate the quality and processing technology of Fenggang zinc-selenium tea in different processing stages. The samples were extracted by headspace solid phase microextraction, and the fingerprints of 30 batches of Fenggang zinc selenium-tea in different processing stages were established by GC. The software "TCM Chromatographic Fingerprint Similarity Evaluation System (2012 Edition)" was used to construct the fingerprint and evaluate the similarity. Through cluster analysis(HCA), principal component analysis(PCA) and orthogonal partial least square discriminant analysis (OPLS-DA) pattern recognition technology was used to analyze the common peaks of Fenggang zinc-selenium tea fingerprints during different processing stages. The GC fingerprints of 30 batches of Fenggang zinc-selenium tea during different processing stages were matched to 21 common peaks, and two peaks were identified as the common peak 3 was linalool and the common peak 9 was geraniol by comparison with the control product, and the similarity of fingerprints was in the range of 0.814~0.987. HCA divided 30 batches of Fenggang zinc-selenium tea into three categories, and the processed samples were grouped into one group. Fenggang zinc-selenium tea was different before and after processing by PCA, and 10 different components were screened by OPLS-DA. The fingerprint of Fenggang zinc-selenium tea in different processing stages, combined with chemical pattern recognition, can provide a scientific basis for quality control, comprehensive evaluation and production application of Fenggang zinc-selenium tea in different processing stages.