By using UPLC-QTOF-MS （ultra performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry） to find the main antioxidant active components. The extractive of Lu Mountain Clouds-Mist tea measured by UPLC-QTOF-MS, and 93 kinds of compounds were preliminary identification, including 2 isoflavones, 28 Flavones, 16, 5 Flavanones, 11 organic acids, 4 amino acids and 27 phenolic acids. Lu Mountain Clouds-Mist tea by feature extraction and quantitative comparison, building PLS-DA model for testing the authenticity of tea samples. Results： the Lu Mountain Clouds-Mist tea can be authenticity identified and could be 100% correctly discriminated.