Abstract:This paper expounds the important influence of low-altitude wind shear on aviation flight and the development and current situation of the global low-altitude wind shear warning system.Meanwhile,the design of wind shear early warning system is introduced in detail.And the LLWAS algorithm suitable for field environment of Shuangliu airport is studied.The LLWAS algorithm is tested iteratively by taking the example of the wind shear at Chengdu Shuangliu airport and the localized wind shear threshold is generated.