半夏、山珠半夏与水半夏各药材的70％乙醇提取液，其紫外光谱具有明显的特征性，依据各特征吸收波长，可鉴别3种半夏。本文还测定了不同产地的半夏，其紫外光谱的特征吸收波长基本一致。

Alcoholic (70%) extract of Pinellia ternate, Arisaeme yunnanense and Typhonium flagelliforme were analysed by UY-spectrometry. Results showed that each of them had its own characteristics spectrum and was repcatable. This provides a method for the identification of three kinds of drug.It was discovered that the wavelength of maximum absorbance showed aggreement,when P.ternata from different origin were analysed by UV-spectrometry.