Abstract: There is a demand to image the simple internal structures of components by digital radiography (DR) technology in practical applications. This feasibility of DR technology in internal structure imaging was discussed in this paper. 4 samples with relatively simple internal structures were selected as test objects. Based on the optimization of parameters such as focus size, exposure tube voltage, tube current, magnification, and image acquisition mode, DR technology was used to image their internal structures. The results showed that for simple internal structures such as the distribution of single layer wiring harness inside a circular cavity, the deformation of metal coils inside a cylindrical cavity, the distribution of reinforcing fibers at the cross-section of composite bullet-resistant ceramics, and the bullet hole morphology after the target test of ceramic composite armor plates, DR technology could achieve good imaging results.