Abstract: The research of total focusing method (TFM) imaging technology mainly focuses on the use of one-dimensional array to realize two-dimensional total focusing method (TFM) imaging. In this paper, the focusing algorithm was extended to three-dimension based on two-dimensional array, TFM process was implemented by hardware based on high speed parallel computing ability of FPGA. The refresh rate of detection results image can be up to twenty frames per second, real-time data processing capacity is about 2G bytes per second, and hence the real time 3D-TFM detection is realized in real sense. The simulation and system experiments show that, compared with the 2D-TFM imaging results, 3D-TFM imaging results are more intuitive, and the whole structure of the defect can be truly restored.