[Objective] To establish the method of fingerprint analysis on volatile oil of the flower of gardenia by GC-MS to provide reference for quality control of gardenia.[Method] Volatile oil were obtained by steam distillation,and the chromatographic fingerprint were determined by GC-MS.mutual fingerprint of eight samples of the essential oil of the flower of gardenia was established by the alike calculation software of Chinese herb fingerprint spectra recommended by National Medicine Supervision Administration....