An x-ray linear array transducer was used to scan standard samples of wooden doors and the radiation intensity changes were detected. Noise removing, non-linear gray transformation and morphological processing techniques were also used. The results showed that X-ray imaging technology could be used to identify internal material types, such as solid wood, fiberboard, particleboard, hollow particle board and honeycomb paper, etc, as well as structural characteristics of wooden door leaves. The technology can realize nondestructive testing of wooden door products, which not only saves timber resources, but also improves quality detection efficiency.