With the development of the modern automotive headlight, the traditional lens headlamp is now gradually being eliminated, because the design is complicated, inefficiency and the impact of the automotive appearance. The freeform reflector becomes the predominant designation. Based on the GB4599-2007 regulation, on this premise of getting the light source properties, a freeform reflector for H7 halogen is designed using RefCAD and LightTools. After analysis of the illumination values for each test point and region, the results show that the illumination distributions meet requirements of GB4599-2007 regulation for dipped headlight. The method can greatly shorten the headlight design cycle and provide a reference for powerful LED used in headlamp design.