The surface of inorganic pigments was modified as an alternative method to provide a competitive edge for the nation's paper industries. The particle sizes of inorganic pigments for paper applications such as clay, talc, CaCO₃, and TiO₂ were measured. The selected core particles and fine particles were then mixed at a calculated ratio. When the sample was electrified, the fine particles adhered to the larger ones due to the static electricity. These powders were then modified by the impact force resulting from a very high-speed air circulation. During the surface modifying of pigments, the energy change caused by the fine powder adhering to the core powder was measured and tuilized in examining the efficiency of the surface modification due to the change in particle size. The change of optical properties of pigment during the surface modification was confirmed by measuring the brightness and scattering rate of surface modified pigments and mixed pigments. After putting these surface modified pigments in water, their static electricity properties were measured with a particle charge detector and a zeta potential tester. From these results, it was revealed that some of the basic powder properties of paper-making inorganic pigment were improved.