Abstract: The physicochemical properties of lacquer oils from Shanxi under different pretreatments were studied in this paper. Chemical constituents of lacquer oils of Rhus Succedanea L., seeding and grafting Rhus Succedanea L. from Jianxi were studied too. The results showed that lacquer oils after aqueous wash or soaked by petroleum ether are light and clarify in color, and its yield improves from 9.61% to 14.87% accordingly. Meanwhile, their acid value are 9.79 and 6.95, respectively. This result is clearly lower than the lacquer oils without any pretreatment. The saponification value and peroxide value are lower, too. That the content of linoleic acid in lacquer oils from Shanxi is higher than 72% results in a high application value. The skin and kernels of the introduced lacquer berries from Jiangxi are easier to be separated. Their relative contents of the linoleic acid are 56.222%.