Tropospheric aerosols are usually complex mixtures of inorganic and organic components, which can influence the hygroscopicities of each other: In this research, we applied confocal Raman technology combined with optical microscopy to investigate the relationship between the hygroscopic behavior and the molecular interactions of mixed glycerol/Mg(NO3)(2)/water droplets: Raman spectra provide detailed structural information about the interactions between glycerol molecules and Mg2+ ions, as well as information about the interactions between glycerol and NO3- ions through electrostatic interaction and hydrogen bonding, The change of the CH2 stretching band of glycerol molecules in mixed droplets Suggests that the backbone structures of glycerol mainly transform from alpha alpha to gamma gamma in the dehumidifying process, and the additional Mg2+ ions strongly influence the structure of glycerol molecules. Because the existence of glycerol suppresses the crystallization of Mg(NO3)(2)center dot 6H(2)O in the dehumidifying process, Mg(NO3)(2) molecules in mixed droplets-form an amorphous state rather than forming crystals of Me(NO3)(2)center dot 6H(2)O when the relative humidity is lower than 17.8%, Moreover, in mixed droplets, the molar ratio, of NO3- to glycerol is higher in the center than in the outer region.