Abstract:To explore the effect of storage time on volatile organic compounds（VOCs）in Potentilla fruticosa black tea，the composition of VOCs in P. fruticosa black tea in 2019，2020 and 2021 was determined by gas chromatography-ion mobility spectroscopy（GC-IMS）. The results showed that 61 signal peaks were identified from P.fruticosa black tea samples by GC-IMS，and 43 VOCs were determined by built-in database，including 20 aldehydes，8 ketones，7 alcohols，2 esters，2 alkenes，2 pyrazines and 1 furan.According to principal component analysis（PCA），the samples in 2019 were quite different from those in 2020 and 2021. The fingerprint analysis found that the type and the concentration of VOCs in 2021 were relatively large with the extension of storage time，and those of VOCs in 2019 were the lowest.Through the determination of importance of projection（VIP）value in partial least square regression，14 potential characteristic VOCs in P. fruticosa black tea were analyzed.In combination of cluster heat map，it was found that with the extension of storage time，ethanol，benzaldehyde（M），2-methylbutyraldehyde（D），dimethyl trisulfide and NF-12 increased gradually，while acetoin，hexanal，acetone，trans-2-pentenal，nonanal（M），2-hexenal（M），NF-3，NF-4 and NF-18 decreased gradually.