Five C 16-alkynic fatty acids (2—6) were prepared and examined their inhibitory effects on cancer cell invasion. It has been found that hexadeca-6, 8, 10-triynoic acid (5) and hexadeca- 8, 10, 12-triynoic acid (6) exhibit similar potent inhibitory activities with that of octadeca-8, 10, 12-triynoic acid (1) which was isolated from Scurrula atropurpurea (Loranthaceae).