[Objective] To study the components and their difference of the volatile oil of RHIZOMA CORYDALIS from Shaanxi and Jiangsu Province.[Method] The volatile oil of RHIZOMA CORYDALIS from different producing area was extracted by steam distillation,and its chemical compositions were detected by gas chromatograph-mass spectrometer(GC-MS).[Result] 35 and 30 compositions were respectively identified from the RHIZOMA CORYDALIS from Shaanxi and Jiangsu Province,accounting for 70.57% and 66.41% of the total volatile ...