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采用二阶导数光谱法测定石杉碱甲片剂含量，取其导数光谱特征振幅作为定量信息，并可消除片剂辅料的干扰。标准曲线的相关系数ｒ＝１．０００，平均回收率为９９．０％．方法简便，正确。
Huperzine A tablet content was determined by second order derivative spectroscopy. The amplitude of the derivative spectrum was taken as quantitative information, and the interference of tablet excipients was eliminated. The standard curve of the correlation coefficient r = 1.000, the average recovery was 99.0%. Method is simple and correct.