Halide perovskites have properties of high photoluminescence quantum yi eld and narrow emission band,which can be used as a new X-ray detection material recen tly.But it also has problems of low light and thermal stability and lead toxicity.Here,we report an inorganic lead-free perovskite nanocrystal material of Cs₃Cu₂I_5prepared by using a solution method. Under X-ray radiation,we analyze its luminescence characteristics and explore the relationship between the conversion efficiency of Cs₃Cu₂I_5nanocrystal materials in dif ferent thicknesses and the X-ray source tube voltage.In the imaging experiment,we design an effi cient Cs₃Cu₂I_5material scintillator conversion screen,then develop an X-ray imaging system b ased on it. Finally,we perform X-ray imaging of the razor blade and the snail shell respec tively.The experimental results show that the emission peak of perovskite Cs₃Cu₂I_5re aches its peak at a wavelength of 460nm under X-ray radiation;when the thickness is 0.30—0.50mm ,the conversion efficiency of Cs₃Cu₂I_5material is higher;the imaging results show that the image outline is clear and the internal structure of the object structured.Our result s show that the lead-free perovskite Cs₃Cu₂I_5nanocrystal material can be used as a new t ype of scintillator, which has huge application potential in X-ray detection and imaging.