Natural Cordyceps usually has rarity and upstanding curative effects on the disease, but some substitutes also have beenused and adulterants confused the market. Therefore, controlling the quality of Cordyceps sinensis and its products isvery critical to ensure their safety and efficacy. Terahertz spectroscopy can be used to qualitatively analyze complex mixedsystems, examine all components of medicinal herbs, and reflect the overall information of samples. We reportexperimental measurement of Hirsutella sinensis, one of the Cordyceps sinensis myceliums in the spectral range of 0.2-2.5 THz using terahertz time-domain spectroscopy (THz-TDS). Additionally, we demonstrate that THz-TDS combiningwith principal component analysis (PCA) methods was proposed for the identification of Cordyceps sinensis mycelium.The results of chemometric analysis show that the method can better detect the stability of traditional Chinese medicine.
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