The optimal conditions for the determination of trace arsenic by flow injection hydride generation atomic absorption spectrometry were discussed, and the flow injection hydride generation atomic absorption spectrometry analysis method for trace arsenic in traditional Chinese medicine was established. The detection limit of arsenic is 0.59 g / L, the linear range is 0-30 g / L, the linear regression equation is A = 0.02228c + 6.282 × 10E-3, the correlation coefficient r = 0.9992, and the relative standard deviation is 2.6%-4.4%, the recovery rate is 91%-103%. The method is easy and fast to operate, with high sensitivity and high degree of automation
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