Abstract: Low-level jet is of great significance to aviation security and severe weather warning and forecast. In ordar to study the structual features of low-level jet, the wind lidar data from xining airport from 2017-11-30 to 2017-12-01 were analyzed in detail. Results show that the low-level jet velocity decreased after the first increased with height, the strength and thickness decreased with time, and the jet axis height increased with time. There appeared a cold advection in the center of the jet, and its intensity drops with the jetdecreases. The rushing wind turn along with height at the top of the jet, and the turbulence is strong. The jet structure was damaged at 01:30, and the turbulent intensity reached the maximum. After 21:00, the turbulence cluster appeared in the low-level jet, and the wind speed fluctuation was obvious. The turbulence cluster scale first increased and then decreased. The results showed that the wind lidar has a very good detection effect on the structural characteristics of low-level jet as well as the internal intensity and pulsation of low-level jet.