Abstract: The volatile componends in leaf of yousong and jianyesong were analyzed.The volatile componends in leaf of yousong and jianyesong were extracted by steam-distillation. The componends were separated by gas chromatography, and identified by mass spectrometry. The results show that 37 and 34 chemical components are identified, respectively. The contents of the identified compounds account for 98.67% and 98.54% in the total volatile substances detected, respectively. The relative contents of the compounds of the volatile oils are determined using the normalization method.