Electrostatic powder spraying process features, green technology, energy-saving, safe, less pollution. The surface coating of industrial fan blades produced by our company has the advantages of uniform color, corrosion resistance, impact resistance, strong adhesion and good weather resistance. However, during the process of electrostatic spraying on the blades, many quality problems also appear in the surface coating. This is an unavoidable problem, so we must strengthen the production process control and find out the problems to solve, this ensures that the surface quality will not be affected by electrostatic coating, resulting in unnecessary costs. First we need to understand the principle of powder coating: Industrial Fan Blade electrostatic powder coating mainly using high-voltage electrostatic method. As industrial fans are mainly used in large space, the powder is usually thermosetting polyester powder coating with good comprehensive properties. The basic principle is that the electrodes on the lance body are connected with the high-voltage generator, which generates a high-voltage static electric field and causes corona ionization of the air around the Lance, the powder particles collide with the ionized air particles to form negatively charged particles, which are then transported to the grounding workpiece by the airflow and adsorbed. And then curing the powder coating by baking, so as to achieve the coating purpose.