Objective: To research the infrared and Raman spectroscopic of three batches of realgar and one batch of realgar piece. Method: The realgar samples were identified and analyzed by Fourier transform infrared spectroscopy and Raman spectroscopy combine with second derivative Raman spectroscopy. Result: There appear infrared absorption peak near the location of 3 400

1 630 cm-1 of each sample; there also appear the absorption peaks in the range of 1 500 cm-1 to 400 cm-1. However

none of them is the characteristic infrared absorption peak of realgar. There appear strong characteristic Raman peaks at the wave number location of 182

234

271

342 cm-1

etc

both in Raman spectroscopy and its second derivative spectra. Conclusion: Infrared spectroscopy is not applicable for identify the characteristics of realgar; Raman spectroscopy can reflect characteristic absorption peaks of realgar better than Infrared spectroscopy

and it has the advantages of fast

easy

accurate

etc. This method is worth to get a wider range of applications in the identification of traditional Chinese medicine.