This paper studies the extraction of essential oil from Diospyros L.leaves by steam distillation.The optimum extraction technological conditions according to orthogonal tests are as follows:adding 8 times water(w/w) ,dipping for 1.0 h,stirring for 20 min,then steam distilling for 2 h.Different growing and storing periods showed different yields and the highest yield occured on October and decreased from 3.71%(0 month) to 2.13%(12 months) during (storing).The essential oil extracted by steam distillation is ...