Abstract: The main focus of this article lies in the investigation of gadolinium oxysulfide. By using the sulfur melting technique, fluorescent powder was created, with doping ions Tb³⁺ and La³⁺ of rare earth integrated. Various methods such as fluorescence spectroscopy, X-ray diffraction were employed to investigate how rare earth terbium and lanthanum doping impacts the lattice structure and luminescent capabilities of gadolinium oxysulfide. The experimental results indicate that the fluorescent powder has a pure hexagonal crystal structure. The luminescence intensity of the fluorescent powder reaches its maximum when the doping concentration of Tb³⁺ is 2mol%. When the La³⁺ doping concentration is 60mol%, the luminescence intensity is 1.9 times that of the undoped La³⁺ sample. Therefore, introducing rare earth Terbium and Lanthanum atoms can effectively improve the optical properties of fluorescent powders.