In this thesis, we use the incident light source which is collimator light source and calculate the deflection angle for the light source when it light on the default area . After writing program to identify each deflection angle and incidence angle which is desired. By calculating with optical software LightTools, we design the freeform surface lens. The freeform lens designed with LightTools software to simulate the effect of road lighting. From the analysis results, we obtained the energy of each deflection angle when rays pass through freeform lens. We set the spacing by the proportion of energy distribution on the freeform lens. Therefore the lighting results meet CIE road lighting regulations and standards.