This research focuses primarily on investigating the optical scattering characteristics of a structured aluminum surface with periodic circular hollow cavities. The influence of cavity parameters on the scattering characteristics is examined through numerical computation and experimentation. The numerical computations reveal that the reflectance characteristics are primarily determined by the depth and radius of the cavities, as well as the angle of incidence. The samples with periodic microstructures were fabricated, and their bidirectional reflectance distribution function (BRDF) was measured. The measurement results demonstrate good agreement with the numerical computations, indicating that BRDF accurately describes the spectral scattering of the structured surface. This study highlights the significance of comprehensively investigating the scattering properties of microstructures to better understand their reflection properties and evaluate their optical control effects.