Aiming at the glare of LED streat lamp ,a new method based on the design of free-form lens is proposed in this paper .The new lens can achieve single-side asymmetrical bat-wing road light di stribution,which is used to suppress glare.Firstly,the causes of LED street lamp glare are analyzed.The light distribution requirement of asymmetrical single-s id e bat-wins to eliminate the glare is obtained.Through non-imaging optics design,based on the energy conservation law and the Snell′s law,the free-form lens is optimized iteratively.Lambert-type distribution curve of LED is transformed into asymmetrical single-side bat-win g light distribution.According to the light distribution,the lighting angle of the LED street lamp is adjusted,so as to suppress road glare.The light distribution of freeform lens is calculated in ray traing software.Road lighting models with 2or 4lanes are set up in illumination design softwar e.Simulation results show that in one-way lighting environment, this design can maintain uniformity better than 0.65,meanwhile eliminating glare and has good application and development p rospects.