Halide perovskites have properties of high photoluminescence quantum yield and narrow emission band,which can be used as a new X-ray detection material recently.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 Cs3Cu2I5 prepared by using a solution method.Under X-ray radiation,we analyze its luminescence characteristics and explore the relationship between the conversion efficiency of Cs3Cu2I5 nanocrystal materials in different thicknesses and the X-ray source tube voltage.In the imaging experiment,we design an efficient Cs3Cu2I5 material scintillator conversion screen,then develop an X-ray imaging system based on it.Finally,we perform X-ray imaging of the razor blade and the snail shell respectively.The experimental results show that the emission peak of perovskite Cs3Cu2I5 reaches its peak at a wavelength of 460 nm under X-ray radiation;when the thickness is 0.30—0.50 mm,the conversion efficiency of Cs3Cu2I5 material is higher;the imaging results show that the image outline is clear and the internal structure of the object structured.Our results show that the lead-free perovskite Cs3Cu2I5 nanocrystal material can be used as a new type of scintillator,which has huge application potential in X-ray detection and imaging.