The Cs(x)WO3 nanoparticles were synthesized at 800 degrees C under a reducing ambient, and then milled up to nanoscale by a high-energy ball planetary miller. They showed a single phase, and a mean particle size of 80 nm. The Cs contents (x) in Cs(x)WO3 nanoparticles were optimized to be x = 0.32 to maximize the shielding performance around the wavelength of 1200 nm. To compensate still lower absorption above the wavelength of 1200 nm, they were mixed with Sb-doped SnO2 nanoparticles. Thus we achieved the visible transmittance of 70% at 540 nm and the near-infrared absorption of 80% at 1000 nm and 94% at 1400 nm.