Abstract:Objective: To investigate the content and existing conditions of baicalin,berberine and rhein in Sanhuang Xiexin decoction suspension.Method: Three active components(baicalin,berberine and rhein)in different prescriptions of original,absent one ingredient herb,and single herb were determined by HPLC.Result: There were baicalin 1 211 mg,berberine 276 mg and rhein 25 mg in 200 mL Sanhuang Xiexin decoction.Even though there will be precipitation if alkaloid is together with baicalin and some anthraquinones,no obvious interaction showed the affecting extract content between Scutellaria baicalensis and Coptis chinensis.The extracted rhein content can be increased obviously by Scutellaria baicalensis.Rheum patmatum and Coptis chinensis can suppress medicinal composition releaseof each other.Conclusion: The acid and basic components can affect each other and the acid components themselvesalso can affecteach other.