Abstract: The aim of this paper was to research the antifungal and antioxidant activities of Gelidium amansii. According to the results of mycelial growth of plant pathogenic fungi, Gelidium amansii had resourceful antifungal activities sources. The Gelidium amansii showed scavenging capacity to hydroxyl free radical generated by Fenton reaction and to superoxide anion generated by a pyrogallol autoxidation system. The active constituents might be seaweed polysaccharides, flavonoids, steroidal saponins, lactones and coumarins etc.

Key words: Gelidium amansii, antifungal activities, antioxidant activity, active constituents