Abstract: Conventional ultrasonic detector is only receiving one-dimensional ultrasonic signal, resulting in poor visualization and its artificial interpretation. The development of a new concrete structure tomography detection system is necessary. The new system uses the technology of ARM and Linux system and 12-channel for signal synchronization receiving. The inner features of the concrete structures were computed by the improved fast ART algorithm to improve the convergence with higher speed and precision. The real-time imaging results are given to facilitate the detection of the scene and validation of test-retest.