Abstract: Ginseng flowers were extracted by using 50% ethanol aqueous solution to prepared ginsenoside extract. The yield of ginsenoside is 8.17%. The ginsenoside extract added into Fenton reaction system can scavenge hydroxyl free radical (·OH) efficiently. The scavenging effect increases with the addition amount of the ginsenoside extract rising,and is up to the highest at the addition amount of 5% (content of ginsenoside 12.30μg/μl).

Key words: ginseng flower, extract, ginsenosid, scavenging free rodical