[Objective] To qualitatively analyze the purified sesamin and identify the content of its impurities.[Methods] The purified sesamin was qualitatively analyzed by GC-MC.[Result]The gas chromatogram and mass spectrogram of purified sesamin were obtained,and its basic composition and impurities were determined.[Conclusion] By GC-MC,the basic compositions of purified sesamin were identified,which were pure sesamin and few sesamolin and oil.