The function of the wing plate is to prevent the sand and mud that are rolled up by the wheels from splashing to the bottom of the car. Therefore, it is required that the materials used have weather-aging resistance and good formability. The front fender of some cars is made of plastic material with a certain amount of elasticity. Plastic materials have buffering properties and are relatively safe. There are two wings above the left and right front wheels of Santana car, weighing about 1.8kg. It is made of toughened modified PP by injection molding. The wing plate of the heavy Castile King is made of FRP FRP SMC material. The wings of the Steyr 1491 are made of PU elastomers. In the future, PA/PP alloy injection molding is a more extensive development direction.