An X-ray projection model of hollow blades with residual ceramic cores was established to analyze the residual ceramic cores detection principle of X-ray transmission hollow blades.300 kV industrial cone-beam CT system was used to perform transmission imaging of a hollow blades.Accurate 3D data of hollow blade was obtained by 3D reconstruction technology

and the position and size of the residual ceramic cores of the hollow blades could be observed clearly.The detection effect was superior to that of X-ray radiography.The results show that 300 kV industrial cone-beam CT system can meet the requirements of residual ceramic cores detection for hollow blades.