In order to explore the height variation characteristics of the boundary layer over Guanghan Airport, the carrier noise ratio data of Doppler light detection and ranging (LiDAR) was used to invert the boundary layer height over the airport by gradient method, wavelet covariance method, and standard variance method. The calculated data through these methods was then compared with that of the L-band sounding and aircraft detection data. The results show that boundary layer information can be captured well by these methods, and good consistency in the recognition of convective boundary pause can be observed. However, the gradient method shows obvious advantages in accuracy, continuity and stability in the recognition of residual layer pause and stable boundary top layer. During the observation period, the height of the convective boundary layer and the residual layer is about 2000 m, and the height of the stable boundary layer is between 100 m~200 m. The boundary layer height of LiDAR inversion was verified by aircraft detection data and sonde data. Due to the turbulence in the boundary layer, the material boundary layer and the thermal boundary layer were significantly different at certain times. The study can provide early warning information for flight training and better ensure flight safety.