Objective: To evaluate the antioxidative activity of total flavones of Kummerowia striata. Method: The total flavones of K. striata were extracted by 75% ethanol and purified by polyamide resin. And the contents of total flavones were measured. The antioxidative activity of total flavones of K. striata were analyzed by using different assays as 1

1-diphenyl-2-picryhydrozyl radica 12

2-diphenyl-1-(2

4

6-trintrophenyl) hydrazyl (DPPH) radical scavenging

diammonium 2

2'-agino-bis(3-ethylbenzothiazoline-6-salfonate(ABTS+) radical scavenging

superoxide radical scavenging

hydroxyl radical scavenging

reducing power and chelating ability

with the positive control of the antioxidative activity of butgl hydroxy anisd(BHA)

trolox and citric acid. Result: The contents of total flavones of K. striata were (3.26±0.36)%(n=3)

with strong free radical scavenging activity

effective reducing power and chelating ability. The IC50 of inhibition for DPPH radical

ABTS+radical

superoxide radical

hydroxyl radical

reducing power (Fe3+)

reducing power (Cu2+)

chelating ability (Fe2+) and chelating ability (Cu2+) were 7.84

2.384

26.48

1.878

24.67

7.67

77.67

70.15 mg·L-1 respectively. And all were related to the dose. Conclusion: The total flavones of K. striata has obvious antioxidative activity.