目的: 探索测定钩藤中鞣质含量的方法。方法: 本文采用络合滴定法测定了钩藤中鞣质的含量。结 果: 钩藤中鞣质含量为 10%左右。结论: 通过络合滴定法测定钩藤鞣质含量，结果稳定，方法可靠; 以其为该药品 质量评定方面提供科学依据。

Objective: Purpose A method was established for the determination of tannin in croton; Methods: The content of tannin was determined by complex titration．Ｒesults: The tannin content was a- bout 10%．Conclusion: The content of tannin was determined by complex titration，results stable，relia- ble method; In addition，Amino acid content was determined by automatic amino acid analysis．It pro- vides scientific basis for the quality evaluation of the drug．

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