The features of mold design for car mirror are as below: 1. The smooth appearance is very important for car parts. It is prohibited to have any gape among of all assembly parts, hence, the shrinkage ratio is key-point on making mold design. 2. The sliders shall be finished by automatic machinery to ensure the accurate dimension. Meanwhile, the moving position of sliders shall be very stable and precise in order to avoid flash or lines. 3. In order to avoid scratching of texture, the ejecting angle shall be 5 degree above. 4. The plasticizing material flow will influence the surface of car mirror. The plastic material flow channels will be affected by structure of injection runners. Meanwhile, the runner will be the factors of cycle time and material consumption.