The Nd:GGG crystal was grown successfully by the Czochralski method,and its structure was studied by laser Micro-Raman spectra.The Raman peaks and fluorescence peaks were discerned by using two excitation wavelengths(Ar+ 325 nm and 514.5 nm),the appeared fluorescence peaks were analyzed the tetrahedral,octahedral and dodecahedral structure of Nd:GGG crystal were contacted with the Raman peaks,and the vibration modes were also recognized.The obtained results are helpful to research the structure of solid-liquid boundary layer during the Nd:GGG growth and the change rule of the growth unit in the boundary layer.