Abstract: During the take-off and approach landing phases of the aircraft, wind shear is a meteorological phenomenon that seriously endangers the safety of aircraft, how to effectively detect wind shear and timely avoid danger is essential to ensure flight safety. In this paper, an implementation method of applying multi-channel linear frequency modulated continuous wave (LFMCW) radar to low-altitude wind shear detection is proposed. Firstly, the signal model of multi-channel LFMCW radar is introduced. Then the space-time adaptive processing (STAP) method is used to suppress the ground clutter and match the wind shear signal. Finally, the dual-pulse repetition frequency (D-PRF) resolve velocity ambiguity algorithm is used to correct the velocity ambiguity, thereby achieving an accurate estimation of wind speed. The results of the following simulation prove the effectiveness of the proposed method.