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The volatile chemical components of Radix Paeoniae Rubra (RPR) were analyzed by gas chromatography-mass spectrometry with the method of heuristic evolving latent projections and overall volume integration.The results show that 38 volatile chemical components of RPR are determined.accounting for 95.21% of total contents of volatile chemical components of RPR.The main volatile chemical components of RPR are(Z,Z)-9, 12-octadecadienoic acid, n-hexadecanoic acid, 2-hydroxy benzaldehyde, 1-(2-hydroxy-4-methoxyphenyl)-ethanone, 6,6-dimethyl-bicyclo[3.1.1]heptane-2-methanol, 4,7-dimethyl-benzofuran, 4-(1-methylethenyl)-1-cyclohexene-1-carboxaldehyde, and cyclohexadecane.rn