AIM: To establish the quality standard of Siang Pure Oil (menthol, peppermint oil, camphor, cassia oil, basil oil, etc.). METHODS: TLC was used for the identification of cassia oil and basil oil. Capillary gas chromatography (CGC) was used for the identification and determination of camphor and menthol. RESULTS: The TLC and CGC identification were highly specific. The standard curves of camphor and menthol were linear in the range of 0.1018～0.1832?g, and of 0.5947～1.3875?g, respectively. The average recoveries of camphor and menthol were 102.4%, 99.2% and the RSD were 2.3%, 1.4%, respectively. CONCLUSION: This quality standard is capable of effectively controlling the quality of Siang Pure Oil.