Porcelain-fused-to-metal powder is a kind of porcelain material with matching performance melted and covered on the surface of metal crown to overcome the brittleness problem of pure porcelain material. Porcelain-fused-to-metal powder is usually divided into the following types: opaque porcelain; body porcelain (translucent porcelain, dentin porcelain); neck porcelain (gingival porcelain); and enamel porcelain. The differences among the above- mentioned different types of porcelain-fused-to-metal powder in terms of composition and content range shape different performance characteristics of different layers of porcelain. In the physical and chemical performance tests on such products, it is necessary to respectively select each type of porcelain powder. In the same type of porcelain powder, it is feasible to select the most commonly used color code and the darkest color code as the typical model.