This paper sheeting designed optical prism angle to complete the arrangement and warning lights pattern created as a module, which explore the changing angle prism pattern on the R-value for the light intensity and distribution changes. Use LucidShape optical simulation software to analyze the feasibility of legislation through modular design a passing car headlights SAE regulations and produce electrical components to the final injection mold benevolence production products, equipment to make light measurement and simulation analysis on the lights are consistent with the car as a component of a safety warning functions.