The supercritical CO2 extraction-process of ferulic acid from Angelica were optimized in this study,and the components of extracts were analyzed by Gas Chromatography mass spectrometry(GC-MS).The yield of volatile oil and ferulic acid was regarded as the markers and the content of ferulic acid was determined by HPLC.The extraction processing conditions were optimized by orthogonal test.The extraction effects were compared by GC-MS analysis on co-solvent were employed or not.The optimized extraction techniqu...