In this study,a multi wavelength Mie Raman LiDAR is used to gather relative humidity and aerosol optical parameter data to investigate the effects of hygroscopic growth on the optical and microphysical characteristics of aerosol particles.Two typical cases observed at Nyingchi airport on the Tibetan Plateau are chosen for in depth examination at the two dimensional analysis level.Regardless of Case 1 or Case 2,the LiDAR data demonstrates that the hygroscopic growth factor firstly exhibits a fast rising trend,and then grows slowly with the increase of relative humidity.In order to improve the accuracy of the analysis,several models are fitted and compared.The outcomes demonstrates that the three parameter model proposed in this paper has the highest correlation coefficient,proving its validity and accuracy.Furthermore,the dependability of multi wavelength Mie Raman LiDAR in identifying aerosol hygroscopic growth is further validated by contrasting the observational data with nephelometers.The results show that the hygroscopicity,sedimentation,and absorption saturation of aerosol particles have a significant enhancement trend after examining the hygroscopic growth fac tors of aerosols at various heights.This finding adds significant understanding of aerosol properties and offers important empirical support for research on changes in the atmospheric environment in the Tibetan Plateau.