Objective To analysis the volatile components in herbal pair Atractylodes MacrocephalaPericarpium Citri Reticulatae(HP AM-PCR),single herb Atractylodes Macrocephala(AM) and Pericarpium Citri Reticulatae(PCR) quantitatively.Methods Volatile oil from above materials were obtained with water reflux condensation method;oil composition was detected by gas-mass spectrometry(GC-MS) and the data was analyzed with heuristic evolving latent projection(HELP);Comparing the difference between chromatographys to identify the main chemical constituents.Results There was no new compound found in herbal pair.T...