This technology solves the issue of traditional building coatings continuously absorbing heat, leading to heat accumulation. Based on Mie scattering theory, it achieves broad-spectrum regulation by constructing fine micro-nano structures: reflecting most solar radiation while enhancing radiative cooling, ensuring "output > input" of heat for zero-energy efficient cooling. The core process requires strict matching of optical properties and wavelength sizes of micro-nano structures, with high demands on dispersion, spraying, and film-forming equipment.