The word "aerosol" is defined as the solid or liquid particles dispersed in gas phase. The diameter of particles is in the range of 0.002 to 100 mm. Fine particles mean their average size is less than 10 micrometer. If the particle size is less than 0.1 micrometer, the particles is called "ultra-fine particles". The aerosol processing is to use such aerosols to make particles or film. The main research efforts of our group focus on the aerosol processing to fabricate functional materials. Especially, we apply a spray pyrolysis process to design photo-functional or electronic materials with controlled structure. To control the powder propeties such as morphology, particle or grain size, surface area, and microstructure we have developed a variety of preparation strategies which are mostly related to solution techniques. The aerosol processing is also a potential method to prepare nanoparticles. During last a few years, we have conducted the research on the preparation of nano-sized multi-component functional oxides such as BaTiO3, SrTiO3, YSZ, Gd-doped Ceria, etc. Also, we have been developing manyu different aerosol strategies to prepare conductive metal nanoparticles, high efficient visible-light photocatalyst, many different phosphor nanoparticles, high NIR reflective pigments, and down/up multi-functional nanophosphor for security inks. Recently, we are focusing on porous carbon and metal oxide/carbon composites for application to energy storage or electrocheical separation.