［Objective］This paper systematically studies and discusses the particle issues，which is the long-term problems on metallic color of coil coating for appliances.［Methods］ This paperfocuses on the origin and cause analysis of the seedings and particle lines of metallic coating forhousehold appliances. Meanwhile，the influence of different type of aluminum pastes，rheology additiveson the orientation arrangement of aluminum powders and the seedy on the coating surface was studied， and the effects of different adhesion promoters on MEK，grittiness and flexibility performance were further investigates.［Results］The experimental results showed that the morphology and distribution ofparticle size for aluminum powders，as well as the selection of leveling additives and adhesionpromoters in the formula would affect the cleanliness of the surface.［Conclusion］This paper attempts to classify and define the particles on PCM panels，and establish an evaluation method for the cleanliness of coating surface and aluminum powder screening，which provides an effective solution from the perspective of formula design and raw material control.