The paper research use metal materials and plastic materials to analyze the lamp housing of the headlights. Due to the design of the cavity, the design of the overflow channel is made to use the materials PA3_TECHNYL_C 218_V15_Rhodia and MIM_Catamold_316_LA in the Moldex3D software. Thicken design is used to improve the flow balance. The traditional cooling tube was designed to cool the cavity of the study. The parameters of the injection molding were investigated using MIM_Catamold_316_LA and PA6_TECHNYL_C 218_V15_Rhodia.