This article analyzes and summarizes the coating orange peel of automotive topcoats,and clarifies that the main sources of coating orange peel are the rough substrate of the car body steel plate,the uneven layer thickness of the paint,the insufficient leveling of the wet paint film,and the excessive drying rate of the paint film.The production site adopts measures such as improving the roughness of the body steel plate,optimizing plate layer thickness,extending paint wet film leveling time,and adjusting the drying rate of paint film,improved the coating orange peel problem,effectively improve the appearance quality of automobile body painting.