Pine needle leaves contain large amounts of flavonoids,and studys found that pine needle flavonoids have strong scavenging effect on various free radicals,while its total anti-oxidizing activity is very strong.It also has good chelating effect on the metal ion,and to some extent can resist protein carbonylation oxidative.But in different concentration,temperature,pH value conditions,the anti-oxidizing activity of pine needle flavonoids ranges between different levels.The results of experiment showed that the anti-oxidizing activity of pine needle flavonoids was stronger than Vc overall,and at the same time its good synergistic effect with Vc verified.