Nanotechnology is the development of science and technology in the area of physics. Nanometer spray painting is the nanotechnology used in manufacture field. It generates compact nanometer painting on the surface of product including exceptional hardness and high corrosion resistance materials. As a kind of surface treatment, this technology provides varied colors and luster in different extent. It is environment friendly, lower cost and durable. The paint is not eroded so as to protect the inside metal and the material will be eroded if the surface coating is destroyed. With the excellent physical capability, this technology could replace electroplating treatment in some extent.