The light barrier is an important part for the headlamp in the modern projected automobile to adjust the light distribution performance of headlights. The focus method to adjust the position of the light barrier can effectively suppress the chromatism and gradient on the cut-off line, which has the functions of improving driver’s visual comfort and driving safety. An optical design of complex curved surfaces LED automotive headlamp based on light barrier with extended reflectors was adopted, the NX10.0 was used to build the structure model and LucidShape software was used for simulation, the maximum illumination value is 51.9 lx. The light distribution differences of optical design on light barrier with extended reflectors and optical design on conventional light barrier, as well as the comparison of two data under the road lighting standard proposed by Geely Automobile in 2017 were studied. The results show that the light barrier with extended reflectors can effectively improve the basic numerical of each point in the third light distribution zone and the visual brightness at 40 m~50 m ahead of the road, which are beneficial to the road ahead and pedestrians.