The essential oil was obtained from the mixture of soft stems and leaves of Ampelopis grossedentata of spring and summer respectively in the way of steam distillation.26 components in spring sample and 17 components in summer sample were determined by GC MS,and relative confeuts of every component were determined by area nomalization.The results show that chemical components between the spring sample and the summer sample are quite different from each other.The main components of b...