Abstract:Fatty acids in the seed oil of Calophyllum polyanthum growing in Xishuangbanna, Yunnan Province were analyzed by means of GC-MS. Twelve fatty acids amounting to 99.39% of the total contents detected were identified. The main components were linoleic acid (38.75%), palmitic acid (22.42%), oleic acid (22.11%) and stearic acid (9.81%).