In order to compare the application effect of two low altitude wind shear alerting algorithms of combined shear algorithm and the regional divergence algorithm on wind light detection and ranging (LiDAR) in complex wind fields, 15 wind shear cases caused by 3 typical weather processes of convective system, cold front, and momentum down at a typical plateau airport from 2017-12 to 2023-04 were selected for comparative analysis of the effectiveness of the recognition algorithms by using a wind LiDAR radar that is made in China. The results show that the accuracy of the combined shear algorithm and the regional divergence algorithm are 73.3% and 67.7%, respectively. The validity of low-level wind shear alarm obtained by the algorithm can last for more than 10 min. It can be seen that the combined shear algorithm is more advantageous in the identification of small-scale low-level wind shear. However, in the case of convective type and cold front type low-level wind shear with slow wind field change, the recognition rate of the two algorithms is not high. The research results of this paper have a good reference significance for equipment manufacturers to improve the low altitude wind shear alerting algorithm.