The fatty fruit oil of Fissistigma oldhamii collected from Pumat National Park in Vietnam was analyzed by Capillary GC and GC/MS. Twenty five components have been identified, accounting for 69.10 percent of the fatty oil. The major constituents are (Z)-9-octadecenamide (21.69 percent), methyl-9-octadecenoate (7.59 percent), methyl hexadecanoate (6.75 percent), methyl-9-oxo nonanoic (6.60 percent) and 1,2-benbenzenedicarboxylic acid (6.20 percent).