Abstract: The basic principle, components and the key performance of industrial computed tomography (CT) imaging technology are introduced in this work. The presentation also includes mechanism of internal defect in parts remanufactured by laser cladding technology and the practical application of industrial computed tomography in the detection of defects such as crack, voids and inclusions. In allusion to interface defect in parts remanufactured by laser cladding technology, research difficulty and prospect for application of industrial CT technique in detecting the defects in remanufacturing interface are discussed.