[Objective] The effect of crude component of 18 species of Chinese herbals such as Scutellaria Baicalensis Georg Skullcap and others on the nitrite clearance and the content of total flavonoids was studied,and at the same time,the correlation among them was also identified.[Method] The content of total flavonoids in 18 species Chinese herbals and their clearance ability to nitrite were determined with spectrophotometry.[Result] The content of total flavonoids in Exocarpium Citri Tomentosae,Herba Lysimachiae...