For wind shear detection and early warning in civil aviation airport, a three-dimensional lidar was proposed. The lidar adopts pulse coherent detective way of all-fiber, a unique spherical 2D photoelectric scanner and an innovative glide scanning strategy, which realizes the simultaneous measurement of head wind and crosswind shear of glide path. The lidar was tested at Panzhihua Airport from March to November in 2018, which observed the detailed distribution of atmospheric flow and wind shear over and around the airport using a variety of working modes. During the wind season from March to May, the wind shear reported by the crew was detected by the lidar. The most serious case was analyzed, which proved the effectiveness of the 3D lidar in detecting wind shear in the altitude airport with complex geography and climate.