Abstract: In this study,near-infrared spectroscopy was used to collect the near-infrared spectra of different varieties Bletillae Rhizoma and mixed pseudo-powder samples.Then,the qualitative analysis models of Bletillae Rhizoma and mixed pseudo-powder samples were established by cluster analysis.Moreover,external and internal validation of the model were also experimented.Bletilla striata (Thunb.) Reichb.f.,Bletilla ochracea Schltr.,Bletilla formosana (Hayata) Schltr.can be grouped in the wavelength range of 4 400-4 800,5 400-6 600,7 800-10 000 cm^-1.The internal and external verification accuracy reached 100% and 90% respectively.In the range of 5 000-10 000 cm^-1,mixed pseudo-powder samples and Bletilla striata (Thunb.) Reichb.f.can also be clustered into one group.The residuals of the spectral properties are both 0,and the internal and external verification accuracy are both 100%.This technology provides the basis for identification Bletilla striata (Thunb.) Reichb.F,same genus medicine and mixed pseudo-powder samples.

Key words: Rhizoma Bletillae powder, NIRS, qualitative identification, cluster analysis