Abstract:A rapid determination model of Cyperus rotundus moisture，ash and extractive based on Fourier transform infrared spectroscopy（FTIR）was established.The near infrared spectra of 60 samples were collected by ANTARIS II FT-NIR Analyzer.The moisture，ash and extractive content data of 60 samples were measured by the method in the 2015 edition of pharmacopoeia.A rapid model for the determination of moisture，ash and extractive content was established by using TQ Analyst software to determine the moisture，ash and extract content of all the samples obtained from the experiment and the near infrared spectra of Cyperus rotundus.The established Cyperus rotundus rapid determination model of moisture，ash and extractive content could accurately identify and verify the moisture，ash and extractive content of Cyperus rotundus.The water content model of Cyperus rotundus was 0.902 7，root mean square error of calibration（RMSEC）was 0.774，root mean square error of prediction （RMSEP）was 0.521，the ash content model of Cyperus rotundus was 0.988 4，RMSEC was 0.061 9，RMSEP was 0.058 5，the content model of Cyperus rotundus extractive was 0.890 3，RMSEC was 1.25 and RMSEP was 2.33.The established model could accurately determine the content of moisture，ash and extractive，which provides a theoretical basis for the establishment of the quality standard of Cyperus rotundus.