Abstract: The reflection spectrum of rocks and minerals is an important reference for intelligent perception technology and remote sensing information recognition in intelligent mining. Particle size is one of the important factors affecting the reflection spectral characteristics of rocks and minerals. In order to reveal the reflection spectral characteristics of karst type bauxite with different particle sizes, the influence of particle size on the visible and near-infrared spectra of karst type bauxite is elucidated. In the study, the visible light near-infrared reflectance spectra of bauxite (bauxite-bearing rock) samples with different particle sizes were measured using the ASD FieldSpec-4 spectrophotometer. Bauxite and bauxite-bearing rock can be distinguished by characteristic spectra of small particle powder samples at wavelengths of 1800nm, 1900nm, 2160nm, and 2200nm. The research results indicate that as the particle size decreases, the spectral reflectance gradually increases. The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202308090133.